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63-9a=-2(-12a-14)
We move all terms to the left:
63-9a-(-2(-12a-14))=0
We calculate terms in parentheses: -(-2(-12a-14)), so:We get rid of parentheses
-2(-12a-14)
We multiply parentheses
24a+28
Back to the equation:
-(24a+28)
-9a-24a-28+63=0
We add all the numbers together, and all the variables
-33a+35=0
We move all terms containing a to the left, all other terms to the right
-33a=-35
a=-35/-33
a=1+2/33
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