4x-x=30-21

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Solution for 4x-x=30-21 equation: 


Simplifying
4x + -1x = 30 + -21

Combine like terms: 4x + -1x = 3x
3x = 30 + -21

Combine like terms: 30 + -21 = 9
3x = 9

Solving
3x = 9

Solving for variable 'x'.

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

Divide each side by '3'.
x = 3

Simplifying
x = 3

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