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13(x+1)=15
We move all terms to the left:
13(x+1)-(15)=0
We multiply parentheses
13x+13-15=0
We add all the numbers together, and all the variables
13x-2=0
We move all terms containing x to the left, all other terms to the right
13x=2
x=2/13
x=2/13
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