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5x-2(x-3)=42
We move all terms to the left:
5x-2(x-3)-(42)=0
We multiply parentheses
5x-2x+6-42=0
We add all the numbers together, and all the variables
3x-36=0
We move all terms containing x to the left, all other terms to the right
3x=36
x=36/3
x=12
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