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-3(10-2x)=-42
We move all terms to the left:
-3(10-2x)-(-42)=0
We add all the numbers together, and all the variables
-3(-2x+10)-(-42)=0
We add all the numbers together, and all the variables
-3(-2x+10)+42=0
We multiply parentheses
6x-30+42=0
We add all the numbers together, and all the variables
6x+12=0
We move all terms containing x to the left, all other terms to the right
6x=-12
x=-12/6
x=-2
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