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-x/15+3=-3
We move all terms to the left:
-x/15+3-(-3)=0
We add all the numbers together, and all the variables
-x/15+6=0
We multiply all the terms by the denominator
-x+6*15=0
We add all the numbers together, and all the variables
-1x+90=0
We move all terms containing x to the left, all other terms to the right
-x=-90
x=-90/-1
x=+90
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