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7+4x=x-42
We move all terms to the left:
7+4x-(x-42)=0
We get rid of parentheses
4x-x+42+7=0
We add all the numbers together, and all the variables
3x+49=0
We move all terms containing x to the left, all other terms to the right
3x=-49
x=-49/3
x=-16+1/3
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