21=3(x-9)

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Solution for 21=3(x-9) equation:


Simplifying
21 = 3(x + -9)

Reorder the terms:
21 = 3(-9 + x)
21 = (-9 * 3 + x * 3)
21 = (-27 + 3x)

Solving
21 = -27 + 3x

Solving for variable 'x'.

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

Add '-3x' to each side of the equation.
21 + -3x = -27 + 3x + -3x

Combine like terms: 3x + -3x = 0
21 + -3x = -27 + 0
21 + -3x = -27

Add '-21' to each side of the equation.
21 + -21 + -3x = -27 + -21

Combine like terms: 21 + -21 = 0
0 + -3x = -27 + -21
-3x = -27 + -21

Combine like terms: -27 + -21 = -48
-3x = -48

Divide each side by '-3'.
x = 16

Simplifying
x = 16

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