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