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13x-102=7x-0
We move all terms to the left:
13x-102-(7x-0)=0
We add all the numbers together, and all the variables
13x-(+7x)-102=0
We get rid of parentheses
13x-7x-102=0
We add all the numbers together, and all the variables
6x-102=0
We move all terms containing x to the left, all other terms to the right
6x=102
x=102/6
x=17
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