3y+(-4x)=21

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Solution for 3y+(-4x)=21 equation: 


Simplifying
3y + (-4x) = 21

Reorder the terms:
(-4x) + 3y = 21

Solving
(-4x) + 3y = 21

Solving for variable 'x'.

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

Add '-3y' to each side of the equation.
(-4x) + 3y + -3y = 21 + -3y

Combine like terms: 3y + -3y = 0
(-4x) + 0 = 21 + -3y
(-4x) = 21 + -3y

Divide each side by '-4'.
x = -5.25 + 0.75y

Simplifying
x = -5.25 + 0.75y

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