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2x+4(3x-1)=42
We move all terms to the left:
2x+4(3x-1)-(42)=0
We multiply parentheses
2x+12x-4-42=0
We add all the numbers together, and all the variables
14x-46=0
We move all terms containing x to the left, all other terms to the right
14x=46
x=46/14
x=3+2/7
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