21y+3x=-12

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Solution for 21y+3x=-12 equation: 


Simplifying
21y + 3x = -12

Reorder the terms:
3x + 21y = -12

Solving
3x + 21y = -12

Solving for variable 'x'.

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

Add '-21y' to each side of the equation.
3x + 21y + -21y = -12 + -21y

Combine like terms: 21y + -21y = 0
3x + 0 = -12 + -21y
3x = -12 + -21y

Divide each side by '3'.
x = -4 + -7y

Simplifying
x = -4 + -7y

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