X-9-4x=21

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


Simplifying
X + -9 + -4x = 21

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

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

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

Combine like terms: -9 + 9 = 0
0 + X + -4x = 21 + 9
X + -4x = 21 + 9

Combine like terms: 21 + 9 = 30
X + -4x = 30

Add '4x' to each side of the equation.
X + -4x + 4x = 30 + 4x

Combine like terms: -4x + 4x = 0
X + 0 = 30 + 4x
X = 30 + 4x

Simplifying
X = 30 + 4x

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