b-7=-3b+9

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Solution for b-7=-3b+9 equation: 



b-7=-3b+9

We move all terms to the left:

b-7-(-3b+9)=0

We get rid of parentheses

b+3b-9-7=0

We add all the numbers together, and all the variables

4b-16=0

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

4b=16

b=16/4

b=4

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