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10-3(5+2a)=85+3a
We move all terms to the left:
10-3(5+2a)-(85+3a)=0
We add all the numbers together, and all the variables
-3(2a+5)-(3a+85)+10=0
We multiply parentheses
-6a-(3a+85)-15+10=0
We get rid of parentheses
-6a-3a-85-15+10=0
We add all the numbers together, and all the variables
-9a-90=0
We move all terms containing a to the left, all other terms to the right
-9a=90
a=90/-9
a=-10
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