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12x-3x-102=13x+3x+34
We move all terms to the left:
12x-3x-102-(13x+3x+34)=0
We add all the numbers together, and all the variables
12x-3x-(16x+34)-102=0
We add all the numbers together, and all the variables
9x-(16x+34)-102=0
We get rid of parentheses
9x-16x-34-102=0
We add all the numbers together, and all the variables
-7x-136=0
We move all terms containing x to the left, all other terms to the right
-7x=136
x=136/-7
x=-19+3/7
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