21b+9=15b+b

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


Simplifying
21b + 9 = 15b + b

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

Combine like terms: 15b + b = 16b
9 + 21b = 16b

Solving
9 + 21b = 16b

Solving for variable 'b'.

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

Add '-16b' to each side of the equation.
9 + 21b + -16b = 16b + -16b

Combine like terms: 21b + -16b = 5b
9 + 5b = 16b + -16b

Combine like terms: 16b + -16b = 0
9 + 5b = 0

Add '-9' to each side of the equation.
9 + -9 + 5b = 0 + -9

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

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

Divide each side by '5'.
b = -1.8

Simplifying
b = -1.8

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