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7x-2=4x+55
We move all terms to the left:
7x-2-(4x+55)=0
We get rid of parentheses
7x-4x-55-2=0
We add all the numbers together, and all the variables
3x-57=0
We move all terms containing x to the left, all other terms to the right
3x=57
x=57/3
x=19
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