21b+3=15b+9

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


Simplifying
21b + 3 = 15b + 9

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

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

Solving
3 + 21b = 9 + 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.
3 + 21b + -15b = 9 + 15b + -15b

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

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

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

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

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

Divide each side by '6'.
b = 1

Simplifying
b = 1

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