5x+4y=-21

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Solution for 5x+4y=-21 equation: 


Simplifying
5x + 4y = -21

Solving
5x + 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.
5x + 4y + -4y = -21 + -4y

Combine like terms: 4y + -4y = 0
5x + 0 = -21 + -4y
5x = -21 + -4y

Divide each side by '5'.
x = -4.2 + -0.8y

Simplifying
x = -4.2 + -0.8y

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