5b+21=2b+9

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Solution for 5b+21=2b+9 equation:


Simplifying
5b + 21 = 2b + 9

Reorder the terms:
21 + 5b = 2b + 9

Reorder the terms:
21 + 5b = 9 + 2b

Solving
21 + 5b = 9 + 2b

Solving for variable 'b'.

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

Add '-2b' to each side of the equation.
21 + 5b + -2b = 9 + 2b + -2b

Combine like terms: 5b + -2b = 3b
21 + 3b = 9 + 2b + -2b

Combine like terms: 2b + -2b = 0
21 + 3b = 9 + 0
21 + 3b = 9

Add '-21' to each side of the equation.
21 + -21 + 3b = 9 + -21

Combine like terms: 21 + -21 = 0
0 + 3b = 9 + -21
3b = 9 + -21

Combine like terms: 9 + -21 = -12
3b = -12

Divide each side by '3'.
b = -4

Simplifying
b = -4

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