-21-4x=9-9x

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Solution for -21-4x=9-9x equation:


Simplifying
-21 + -4x = 9 + -9x

Solving
-21 + -4x = 9 + -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 + -4x + 9x = 9 + -9x + 9x

Combine like terms: -4x + 9x = 5x
-21 + 5x = 9 + -9x + 9x

Combine like terms: -9x + 9x = 0
-21 + 5x = 9 + 0
-21 + 5x = 9

Add '21' to each side of the equation.
-21 + 21 + 5x = 9 + 21

Combine like terms: -21 + 21 = 0
0 + 5x = 9 + 21
5x = 9 + 21

Combine like terms: 9 + 21 = 30
5x = 30

Divide each side by '5'.
x = 6

Simplifying
x = 6

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