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7x=4x-42
We move all terms to the left:
7x-(4x-42)=0
We get rid of parentheses
7x-4x+42=0
We add all the numbers together, and all the variables
3x+42=0
We move all terms containing x to the left, all other terms to the right
3x=-42
x=-42/3
x=-14
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