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13(x)=x-8
We move all terms to the left:
13(x)-(x-8)=0
We get rid of parentheses
13x-x+8=0
We add all the numbers together, and all the variables
12x+8=0
We move all terms containing x to the left, all other terms to the right
12x=-8
x=-8/12
x=-2/3
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