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15=2a+1+5a
We move all terms to the left:
15-(2a+1+5a)=0
We add all the numbers together, and all the variables
-(7a+1)+15=0
We get rid of parentheses
-7a-1+15=0
We add all the numbers together, and all the variables
-7a+14=0
We move all terms containing a to the left, all other terms to the right
-7a=-14
a=-14/-7
a=+2
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