X-21=4y

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Solution for X-21=4y equation: 


Simplifying
X + -21 = 4y

Reorder the terms:
-21 + X = 4y

Solving
-21 + X = 4y

Solving for variable 'X'.

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

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

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

Simplifying
X = 21 + 4y

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