21=-3x-7y

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Solution for 21=-3x-7y equation:


Simplifying
21 = -3x + -7y

Solving
21 = -3x + -7y

Solving for variable 'x'.

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

Add '3x' to each side of the equation.
21 + 3x = -3x + 3x + -7y

Combine like terms: -3x + 3x = 0
21 + 3x = 0 + -7y
21 + 3x = -7y

Add '-21' to each side of the equation.
21 + -21 + 3x = -21 + -7y

Combine like terms: 21 + -21 = 0
0 + 3x = -21 + -7y
3x = -21 + -7y

Divide each side by '3'.
x = -7 + -2.333333333y

Simplifying
x = -7 + -2.333333333y

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