8b-30=-2b+40

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Solution for 8b-30=-2b+40 equation: 



8b-30=-2b+40

We move all terms to the left:

8b-30-(-2b+40)=0

We get rid of parentheses

8b+2b-40-30=0

We add all the numbers together, and all the variables

10b-70=0

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

10b=70

b=70/10

b=7

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