123=b-7

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Solution for 123=b-7 equation: 



123=b-7

We move all terms to the left:

123-(b-7)=0

We get rid of parentheses

-b+7+123=0

We add all the numbers together, and all the variables

-1b+130=0

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

-b=-130

b=-130/-1

b=+130

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