21-x=3x+9

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Solution for 21-x=3x+9 equation:


Simplifying
21 + -1x = 3x + 9

Reorder the terms:
21 + -1x = 9 + 3x

Solving
21 + -1x = 9 + 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 + -1x + -3x = 9 + 3x + -3x

Combine like terms: -1x + -3x = -4x
21 + -4x = 9 + 3x + -3x

Combine like terms: 3x + -3x = 0
21 + -4x = 9 + 0
21 + -4x = 9

Add '-21' to each side of the equation.
21 + -21 + -4x = 9 + -21

Combine like terms: 21 + -21 = 0
0 + -4x = 9 + -21
-4x = 9 + -21

Combine like terms: 9 + -21 = -12
-4x = -12

Divide each side by '-4'.
x = 3

Simplifying
x = 3

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