15b+40=5b-120

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Solution for 15b+40=5b-120 equation: 



15b+40=5b-120

We move all terms to the left:

15b+40-(5b-120)=0

We get rid of parentheses

15b-5b+120+40=0

We add all the numbers together, and all the variables

10b+160=0

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

10b=-160

b=-160/10

b=-16

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