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13=3x/7-8
We move all terms to the left:
13-(3x/7-8)=0
We get rid of parentheses
-3x/7+8+13=0
We multiply all the terms by the denominator
-3x+8*7+13*7=0
We add all the numbers together, and all the variables
-3x+147=0
We move all terms containing x to the left, all other terms to the right
-3x=-147
x=-147/-3
x=+49
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