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-13=-x/4-15
We move all terms to the left:
-13-(-x/4-15)=0
We get rid of parentheses
x/4+15-13=0
We multiply all the terms by the denominator
x+15*4-13*4=0
We add all the numbers together, and all the variables
x+8=0
We move all terms containing x to the left, all other terms to the right
x=-8
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