3b+15=4b+7

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Solution for 3b+15=4b+7 equation: 



3b+15=4b+7

We move all terms to the left:

3b+15-(4b+7)=0

We get rid of parentheses

3b-4b-7+15=0

We add all the numbers together, and all the variables

-1b+8=0

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

-b=-8

b=-8/-1

b=+8

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