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15+10a=1+12a
We move all terms to the left:
15+10a-(1+12a)=0
We add all the numbers together, and all the variables
10a-(12a+1)+15=0
We get rid of parentheses
10a-12a-1+15=0
We add all the numbers together, and all the variables
-2a+14=0
We move all terms containing a to the left, all other terms to the right
-2a=-14
a=-14/-2
a=+7
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