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-3(x+4)=2x-42
We move all terms to the left:
-3(x+4)-(2x-42)=0
We multiply parentheses
-3x-(2x-42)-12=0
We get rid of parentheses
-3x-2x+42-12=0
We add all the numbers together, and all the variables
-5x+30=0
We move all terms containing x to the left, all other terms to the right
-5x=-30
x=-30/-5
x=+6
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