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-13=x/15+4
We move all terms to the left:
-13-(x/15+4)=0
We get rid of parentheses
-x/15-4-13=0
We multiply all the terms by the denominator
-x-4*15-13*15=0
We add all the numbers together, and all the variables
-1x-255=0
We move all terms containing x to the left, all other terms to the right
-x=255
x=255/-1
x=-255
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