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Are you using - to mean minus or just a dash? In Equation - 5+2(x+4)=10-5(x-3), is the equation supposed to be - 5+2(x+4)=10-5(x-3) OR 5+2(x+4)=10-5(x-3)? It is dangerous to use dashes in mathematics.
I thought that Stan's equation is this: - 5+2(x+4)=10-5(x-3). I got the same thing he did for his first step.
In your work, I think you lost the negative sign in front of the 5. My work: Equation - 5+2(x+4)=10-5(x-3) 5+2x+8=10+-5+15
Well, I don't usually use dashes, it is just hard for me to type math problems on a computer. The equation is 5+2(x+4)=10-5(x-3).
I got this for the first step which is what Stan got: 5+2x+8=10-5x+15 5+2x+8=10+-5+15 yours You left out the x on +-5 + 15 but I think you got what Stan did.
Do you think that this step Stan did is correct: Step 3) 13-3x=25
Let's look at it: Step 2) 13 +2x = 25 - 5x +5x = + 5x ---------------------------- 13 + 7x = 25
7x/7=12/7 x=1 7/10 12/7 = 1 5/7
Step 3 is where I think Stan made an error. What do you think: Step 3: 13-3x=25
Because: Step 2) 13+2x=25-5x 13 + 5x + 2x = 25 Step 3) 13+ 7x = 25 That is not what Stan got for Step 3.
No, Stan messed up Step 3. Step 1 and 2 in my work looked the same as Stan's. Stan subtracted 5 from 2x instead of adding 5 to 2x.
You are welcome.