b-8+4b=31

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Solution for b-8+4b=31 equation: 


Simplifying
b + -8 + 4b = 31

Reorder the terms:
-8 + b + 4b = 31

Combine like terms: b + 4b = 5b
-8 + 5b = 31

Solving
-8 + 5b = 31

Solving for variable 'b'.

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

Add '8' to each side of the equation.
-8 + 8 + 5b = 31 + 8

Combine like terms: -8 + 8 = 0
0 + 5b = 31 + 8
5b = 31 + 8

Combine like terms: 31 + 8 = 39
5b = 39

Divide each side by '5'.
b = 7.8

Simplifying
b = 7.8

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