b-4+8b=21

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Solution for b-4+8b=21 equation:


Simplifying
b + -4 + 8b = 21

Reorder the terms:
-4 + b + 8b = 21

Combine like terms: b + 8b = 9b
-4 + 9b = 21

Solving
-4 + 9b = 21

Solving for variable 'b'.

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

Add '4' to each side of the equation.
-4 + 4 + 9b = 21 + 4

Combine like terms: -4 + 4 = 0
0 + 9b = 21 + 4
9b = 21 + 4

Combine like terms: 21 + 4 = 25
9b = 25

Divide each side by '9'.
b = 2.777777778

Simplifying
b = 2.777777778

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