X=4X-21

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Solution for X=4X-21 equation: 


Simplifying
X = 4X + -21

Reorder the terms:
X = -21 + 4X

Solving
X = -21 + 4X

Solving for variable 'X'.

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

Add '-4X' to each side of the equation.
X + -4X = -21 + 4X + -4X

Combine like terms: X + -4X = -3X
-3X = -21 + 4X + -4X

Combine like terms: 4X + -4X = 0
-3X = -21 + 0
-3X = -21

Divide each side by '-3'.
X = 7

Simplifying
X = 7

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