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7x=102+4x
We move all terms to the left:
7x-(102+4x)=0
We add all the numbers together, and all the variables
7x-(4x+102)=0
We get rid of parentheses
7x-4x-102=0
We add all the numbers together, and all the variables
3x-102=0
We move all terms containing x to the left, all other terms to the right
3x=102
x=102/3
x=34
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