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(15-x)/3=-9
We move all terms to the left:
(15-x)/3-(-9)=0
We add all the numbers together, and all the variables
(-1x+15)/3-(-9)=0
We add all the numbers together, and all the variables
(-1x+15)/3+9=0
We multiply all the terms by the denominator
(-1x+15)+9*3=0
We add all the numbers together, and all the variables
(-1x+15)+27=0
We get rid of parentheses
-1x+15+27=0
We add all the numbers together, and all the variables
-1x+42=0
We move all terms containing x to the left, all other terms to the right
-x=-42
x=-42/-1
x=+42
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