-12+-2b=-20

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Solution for -12+-2b=-20 equation: 



-12+-2b=-20

We move all terms to the left:

-12+-2b-(-20)=0

We add all the numbers together, and all the variables

-2b+8=0

We move all terms containing b to the left, all other terms to the right

-2b=-8

b=-8/-2

b=+4

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