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(3x+4)-(8x+12)=
We move all terms to the left:
(3x+4)-(8x+12)-()=0
We add all the numbers together, and all the variables
(3x+4)-(8x+12)=0
We get rid of parentheses
3x-8x+4-12=0
We add all the numbers together, and all the variables
-5x-8=0
We move all terms containing x to the left, all other terms to the right
-5x=8
x=8/-5
x=-1+3/5
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