-2(a+6.5)=20

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Solution for -2(a+6.5)=20 equation: 



-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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