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15a=20a+10
We move all terms to the left:
15a-(20a+10)=0
We get rid of parentheses
15a-20a-10=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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