9b-21=8b-7

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Solution for 9b-21=8b-7 equation:


Simplifying
9b + -21 = 8b + -7

Reorder the terms:
-21 + 9b = 8b + -7

Reorder the terms:
-21 + 9b = -7 + 8b

Solving
-21 + 9b = -7 + 8b

Solving for variable 'b'.

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

Add '-8b' to each side of the equation.
-21 + 9b + -8b = -7 + 8b + -8b

Combine like terms: 9b + -8b = 1b
-21 + 1b = -7 + 8b + -8b

Combine like terms: 8b + -8b = 0
-21 + 1b = -7 + 0
-21 + 1b = -7

Add '21' to each side of the equation.
-21 + 21 + 1b = -7 + 21

Combine like terms: -21 + 21 = 0
0 + 1b = -7 + 21
1b = -7 + 21

Combine like terms: -7 + 21 = 14
1b = 14

Divide each side by '1'.
b = 14

Simplifying
b = 14

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