## anonymous one year ago What is the solution to the equation? -8x + 9x - 21 = -12 - 16 { }

1. anonymous

-12 - 16 = -28 -8 + 9 - 21 = -20 X = ?

2. anonymous

not -2 that would = 23

3. anonymous

-8 is also a no

4. anonymous

@Nnesha

5. Nnesha

$$\color{blue}{\text{Originally Posted by}}$$ @Demonx341 -12 - 16 = -28 -8 + 9 - 21 = -20 X = ? $$\color{blue}{\text{End of Quote}}$$ you can't can't combine -9and -8 with -21

6. anonymous

? its -8 + 9 - 21

7. Nnesha

they are not like terms you can't combine variable term with just number

8. anonymous

oh XD

9. Nnesha

it's -8x+9x-21 combine like terms here is an example 2x+2x +5= 4x+5 i can't combine 4x with 5

10. ryanwhite499

Let's solve your equation step-by-step. −8x+9x−21=−12−16 Step 1: Simplify both sides of the equation. −8x+9x−21=−12−16 Simplify: (Show steps) x−21=−28 Step 2: Add 21 to both sides. x−21+21=−28+21 x=−7 Answer: x=−7

11. anonymous

-8x + 9x = 1x

12. Nnesha

let him do it.

13. anonymous

btw i have to find out what x = XD

14. anonymous

It would Be -7 Tho :P

15. Nnesha

yes right x -21=-28 right now move the 21 to the right side

16. ryanwhite499

Yes... In my equation... x = -7

17. anonymous

ok XD

18. ryanwhite499

Great Work!

19. anonymous

-28 - 21 = -49

20. Nnesha

nope how would you cancel out -21 from left side would you add ,subtract ,divide or multiply ?

21. anonymous

22. anonymous

-28 + 21= -7

23. Nnesha

looks good!

24. anonymous

1*-7 = -7 xD

25. Nnesha

now you can check ur answer substitute x for -7 $\huge\rm -8(-7)+9(-7)-21=-12-16$ both sides are equal good to go!

26. anonymous

:P both = -28

27. Nnesha

yes right that means x=-7 is correct good work!

28. ryanwhite499

Demon you need to fan me in order for me to send messages back

29. anonymous