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12-43=3(x-4)-7
We move all terms to the left:
12-43-(3(x-4)-7)=0
We add all the numbers together, and all the variables
-(3(x-4)-7)-31=0
We calculate terms in parentheses: -(3(x-4)-7), so:We get rid of parentheses
3(x-4)-7
We multiply parentheses
3x-12-7
We add all the numbers together, and all the variables
3x-19
Back to the equation:
-(3x-19)
-3x+19-31=0
We add all the numbers together, and all the variables
-3x-12=0
We move all terms containing x to the left, all other terms to the right
-3x=12
x=12/-3
x=-4
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