9b+18=6b-21

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Solution for 9b+18=6b-21 equation:


Simplifying
9b + 18 = 6b + -21

Reorder the terms:
18 + 9b = 6b + -21

Reorder the terms:
18 + 9b = -21 + 6b

Solving
18 + 9b = -21 + 6b

Solving for variable 'b'.

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

Add '-6b' to each side of the equation.
18 + 9b + -6b = -21 + 6b + -6b

Combine like terms: 9b + -6b = 3b
18 + 3b = -21 + 6b + -6b

Combine like terms: 6b + -6b = 0
18 + 3b = -21 + 0
18 + 3b = -21

Add '-18' to each side of the equation.
18 + -18 + 3b = -21 + -18

Combine like terms: 18 + -18 = 0
0 + 3b = -21 + -18
3b = -21 + -18

Combine like terms: -21 + -18 = -39
3b = -39

Divide each side by '3'.
b = -13

Simplifying
b = -13

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