21-3x=9x

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Solution for 21-3x=9x equation:


Simplifying
21 + -3x = 9x

Solving
21 + -3x = 9x

Solving for variable 'x'.

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

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

Combine like terms: -3x + -9x = -12x
21 + -12x = 9x + -9x

Combine like terms: 9x + -9x = 0
21 + -12x = 0

Add '-21' to each side of the equation.
21 + -21 + -12x = 0 + -21

Combine like terms: 21 + -21 = 0
0 + -12x = 0 + -21
-12x = 0 + -21

Combine like terms: 0 + -21 = -21
-12x = -21

Divide each side by '-12'.
x = 1.75

Simplifying
x = 1.75

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