x-2y=21

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Solution for x-2y=21 equation: 


Simplifying
x + -2y = 21

Solving
x + -2y = 21

Solving for variable 'x'.

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

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

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

Simplifying
x = 21 + 2y

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