21b+9=15b+3

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Solution for 21b+9=15b+3 equation:


Simplifying
21b + 9 = 15b + 3

Reorder the terms:
9 + 21b = 15b + 3

Reorder the terms:
9 + 21b = 3 + 15b

Solving
9 + 21b = 3 + 15b

Solving for variable 'b'.

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

Add '-15b' to each side of the equation.
9 + 21b + -15b = 3 + 15b + -15b

Combine like terms: 21b + -15b = 6b
9 + 6b = 3 + 15b + -15b

Combine like terms: 15b + -15b = 0
9 + 6b = 3 + 0
9 + 6b = 3

Add '-9' to each side of the equation.
9 + -9 + 6b = 3 + -9

Combine like terms: 9 + -9 = 0
0 + 6b = 3 + -9
6b = 3 + -9

Combine like terms: 3 + -9 = -6
6b = -6

Divide each side by '6'.
b = -1

Simplifying
b = -1

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