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-2(a+6.5)=20
We move all terms to the left:
-2(a+6.5)-(20)=0
We multiply parentheses
-2a-13-20=0
We add all the numbers together, and all the variables
-2a-33=0
We move all terms containing a to the left, all other terms to the right
-2a=33
a=33/-2
a=-16+1/2
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