9+4x-2x=21

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Solution for 9+4x-2x=21 equation: 


Simplifying
9 + 4x + -2x = 21

Combine like terms: 4x + -2x = 2x
9 + 2x = 21

Solving
9 + 2x = 21

Solving for variable 'x'.

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

Add '-9' to each side of the equation.
9 + -9 + 2x = 21 + -9

Combine like terms: 9 + -9 = 0
0 + 2x = 21 + -9
2x = 21 + -9

Combine like terms: 21 + -9 = 12
2x = 12

Divide each side by '2'.
x = 6

Simplifying
x = 6

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