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3-4x+5-7x=8x+15-12x
We move all terms to the left:
3-4x+5-7x-(8x+15-12x)=0
We add all the numbers together, and all the variables
-4x-7x-(-4x+15)+3+5=0
We add all the numbers together, and all the variables
-11x-(-4x+15)+8=0
We get rid of parentheses
-11x+4x-15+8=0
We add all the numbers together, and all the variables
-7x-7=0
We move all terms containing x to the left, all other terms to the right
-7x=7
x=7/-7
x=-1
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