b-7+8b=31

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Solution for b-7+8b=31 equation:


Simplifying
b + -7 + 8b = 31

Reorder the terms:
-7 + b + 8b = 31

Combine like terms: b + 8b = 9b
-7 + 9b = 31

Solving
-7 + 9b = 31

Solving for variable 'b'.

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

Add '7' to each side of the equation.
-7 + 7 + 9b = 31 + 7

Combine like terms: -7 + 7 = 0
0 + 9b = 31 + 7
9b = 31 + 7

Combine like terms: 31 + 7 = 38
9b = 38

Divide each side by '9'.
b = 4.222222222

Simplifying
b = 4.222222222

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