7b-15=3b-3

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Solution for 7b-15=3b-3 equation: 



7b-15=3b-3

We move all terms to the left:

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

We get rid of parentheses

7b-3b+3-15=0

We add all the numbers together, and all the variables

4b-12=0

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

4b=12

b=12/4

b=3

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