21-15=3(x-9)

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Solution for 21-15=3(x-9) equation: 


Simplifying
21 + -15 = 3(x + -9)

Combine like terms: 21 + -15 = 6
6 = 3(x + -9)

Reorder the terms:
6 = 3(-9 + x)
6 = (-9 * 3 + x * 3)
6 = (-27 + 3x)

Solving
6 = -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.
6 + -3x = -27 + 3x + -3x

Combine like terms: 3x + -3x = 0
6 + -3x = -27 + 0
6 + -3x = -27

Add '-6' to each side of the equation.
6 + -6 + -3x = -27 + -6

Combine like terms: 6 + -6 = 0
0 + -3x = -27 + -6
-3x = -27 + -6

Combine like terms: -27 + -6 = -33
-3x = -33

Divide each side by '-3'.
x = 11

Simplifying
x = 11

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