-9+7b=30

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Solution for -9+7b=30 equation: 


Simplifying
-9 + 7b = 30

Solving
-9 + 7b = 30

Solving for variable 'b'.

Move all terms containing b to the left, all other terms to the right.

Add '9' to each side of the equation.
-9 + 9 + 7b = 30 + 9

Combine like terms: -9 + 9 = 0
0 + 7b = 30 + 9
7b = 30 + 9

Combine like terms: 30 + 9 = 39
7b = 39

Divide each side by '7'.
b = 5.571428571

Simplifying
b = 5.571428571

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