-21=9+3(b-6)

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Solution for -21=9+3(b-6) equation:


Simplifying
-21 = 9 + 3(b + -6)

Reorder the terms:
-21 = 9 + 3(-6 + b)
-21 = 9 + (-6 * 3 + b * 3)
-21 = 9 + (-18 + 3b)

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

Solving
-21 = -9 + 3b

Solving for variable 'b'.

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

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

Combine like terms: 3b + -3b = 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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