-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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