4x=9x-21

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Solution for 4x=9x-21 equation: 


Simplifying
4x = 9x + -21

Reorder the terms:
4x = -21 + 9x

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

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

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

Divide each side by '-5'.
x = 4.2

Simplifying
x = 4.2

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