-3x-6y=21

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Solution for -3x-6y=21 equation: 


Simplifying
-3x + -6y = 21

Solving
-3x + -6y = 21

Solving for variable 'x'.

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

Add '6y' to each side of the equation.
-3x + -6y + 6y = 21 + 6y

Combine like terms: -6y + 6y = 0
-3x + 0 = 21 + 6y
-3x = 21 + 6y

Divide each side by '-3'.
x = -7 + -2y

Simplifying
x = -7 + -2y

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