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