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12=-9a+5
We move all terms to the left:
12-(-9a+5)=0
We get rid of parentheses
9a-5+12=0
We add all the numbers together, and all the variables
9a+7=0
We move all terms containing a to the left, all other terms to the right
9a=-7
a=-7/9
a=-7/9
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