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12x=3+7x=13
We move all terms to the left:
12x-(3+7x)=0
We add all the numbers together, and all the variables
12x-(7x+3)=0
We get rid of parentheses
12x-7x-3=0
We add all the numbers together, and all the variables
5x-3=0
We move all terms containing x to the left, all other terms to the right
5x=3
x=3/5
x=3/5
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