X-4y=-21

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Solution for X-4y=-21 equation: 


Simplifying
X + -4y = -21

Solving
X + -4y = -21

Solving for variable 'X'.

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

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

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

Simplifying
X = -21 + 4y

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