## anonymous one year ago ((a-1)/8) - (3(a-4)/10) = ((2a+4)/5) help please

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1. anonymous

solve for a

2. anonymous

$\frac{ a-1 }{ 8 }-\frac{ 3(a-4) }{ 10 }=\frac{ 2a+4 }{ 5 }$ Your denominators are 8, 10 and 5. What's the smallest number that is divisible by all 3 (lcd)?

3. anonymous

80?

4. anonymous

80's not the smallest, but it will still work :) You need to multiply each of the fractions by 80 so the denominators will cancel when you reduce. $\frac{ 80(a-1) }{ 8 }-\frac{ (80)(3)(a-4) }{ 10 }=\frac{ 80(2a+4) }{ 5 }$

5. anonymous

i got 2.215

6. anonymous

7. anonymous

that's not what I got. Can you put up what you did?

8. anonymous

i got -65/23 is that right? @peachpi

9. anonymous

??

10. anonymous

no. the 23 is right, so everything you did with the a is good. check your addition/subtraction with the constants

11. anonymous

11?

12. anonymous

yes

13. anonymous

11/23

14. anonymous

can u show me how you got that

15. anonymous