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25=5a-15
We move all terms to the left:
25-(5a-15)=0
We get rid of parentheses
-5a+15+25=0
We add all the numbers together, and all the variables
-5a+40=0
We move all terms containing a to the left, all other terms to the right
-5a=-40
a=-40/-5
a=+8
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