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)=0

We add all the numbers together, and all the variables

10b-40=0

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

10b=40

b=40/10

b=4

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