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7+9a=10a-5
We move all terms to the left:
7+9a-(10a-5)=0
We get rid of parentheses
9a-10a+5+7=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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