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(-15-a)/3=-9
We move all terms to the left:
(-15-a)/3-(-9)=0
We add all the numbers together, and all the variables
(-1a-15)/3-(-9)=0
We add all the numbers together, and all the variables
(-1a-15)/3+9=0
We multiply all the terms by the denominator
(-1a-15)+9*3=0
We add all the numbers together, and all the variables
(-1a-15)+27=0
We get rid of parentheses
-1a-15+27=0
We add all the numbers together, and all the variables
-1a+12=0
We move all terms containing a to the left, all other terms to the right
-a=-12
a=-12/-1
a=+12
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