-2x-y=-21

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Solution for -2x-y=-21 equation:


Simplifying
-2x + -1y = -21

Solving
-2x + -1y = -21

Solving for variable 'x'.

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

Add 'y' to each side of the equation.
-2x + -1y + y = -21 + y

Combine like terms: -1y + y = 0
-2x + 0 = -21 + y
-2x = -21 + y

Divide each side by '-2'.
x = 10.5 + -0.5y

Simplifying
x = 10.5 + -0.5y

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