2b-21=9+7b

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Solution for 2b-21=9+7b equation:


Simplifying
2b + -21 = 9 + 7b

Reorder the terms:
-21 + 2b = 9 + 7b

Solving
-21 + 2b = 9 + 7b

Solving for variable 'b'.

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

Add '-7b' to each side of the equation.
-21 + 2b + -7b = 9 + 7b + -7b

Combine like terms: 2b + -7b = -5b
-21 + -5b = 9 + 7b + -7b

Combine like terms: 7b + -7b = 0
-21 + -5b = 9 + 0
-21 + -5b = 9

Add '21' to each side of the equation.
-21 + 21 + -5b = 9 + 21

Combine like terms: -21 + 21 = 0
0 + -5b = 9 + 21
-5b = 9 + 21

Combine like terms: 9 + 21 = 30
-5b = 30

Divide each side by '-5'.
b = -6

Simplifying
b = -6

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