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15=5a+5
We move all terms to the left:
15-(5a+5)=0
We get rid of parentheses
-5a-5+15=0
We add all the numbers together, and all the variables
-5a+10=0
We move all terms containing a to the left, all other terms to the right
-5a=-10
a=-10/-5
a=+2
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