42=5b+7

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Solution for 42=5b+7 equation: 



42=5b+7

We move all terms to the left:

42-(5b+7)=0

We get rid of parentheses

-5b-7+42=0

We add all the numbers together, and all the variables

-5b+35=0

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

-5b=-35

b=-35/-5

b=+7

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