-10b+3b=42

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Solution for -10b+3b=42 equation: 



-10b+3b=42

We move all terms to the left:

-10b+3b-(42)=0

We add all the numbers together, and all the variables

-7b-42=0

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

-7b=42

b=42/-7

b=-6

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