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64=0.5(a+12)*4
We move all terms to the left:
64-(0.5(a+12)*4)=0
We calculate terms in parentheses: -(0.5(a+12)*4), so:We get rid of parentheses
0.5(a+12)*4
We multiply parentheses
2a+24
Back to the equation:
-(2a+24)
-2a-24+64=0
We add all the numbers together, and all the variables
-2a+40=0
We move all terms containing a to the left, all other terms to the right
-2a=-40
a=-40/-2
a=+20
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