X+7y=21

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Solution for X+7y=21 equation: 


Simplifying
X + 7y = 21

Solving
X + 7y = 21

Solving for variable 'X'.

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

Add '-7y' to each side of the equation.
X + 7y + -7y = 21 + -7y

Combine like terms: 7y + -7y = 0
X + 0 = 21 + -7y
X = 21 + -7y

Simplifying
X = 21 + -7y

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