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42+7x=4x+77
We move all terms to the left:
42+7x-(4x+77)=0
We get rid of parentheses
7x-4x-77+42=0
We add all the numbers together, and all the variables
3x-35=0
We move all terms containing x to the left, all other terms to the right
3x=35
x=35/3
x=11+2/3
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