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-(x-3)+4x=6x-12
We move all terms to the left:
-(x-3)+4x-(6x-12)=0
We add all the numbers together, and all the variables
4x-(x-3)-(6x-12)=0
We get rid of parentheses
4x-x-6x+3+12=0
We add all the numbers together, and all the variables
-3x+15=0
We move all terms containing x to the left, all other terms to the right
-3x=-15
x=-15/-3
x=+5
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