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10=2a+3a
We move all terms to the left:
10-(2a+3a)=0
We add all the numbers together, and all the variables
-(+5a)+10=0
We get rid of parentheses
-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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