3(-1)2+b(-1)+12=0

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Solution for 3(-1)2+b(-1)+12=0 equation: 



3(-1)2+b(-1)+12=0

We add all the numbers together, and all the variables

b(-1)+6=0

We multiply parentheses

-1b+6=0

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

-b=-6

b=-6/-1

b=+6

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