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(-a+9)/12=2
We move all terms to the left:
(-a+9)/12-(2)=0
We add all the numbers together, and all the variables
(-1a+9)/12-2=0
We multiply all the terms by the denominator
(-1a+9)-2*12=0
We add all the numbers together, and all the variables
(-1a+9)-24=0
We get rid of parentheses
-1a+9-24=0
We add all the numbers together, and all the variables
-1a-15=0
We move all terms containing a to the left, all other terms to the right
-a=15
a=15/-1
a=-15
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