21+3x=-y

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Solution for 21+3x=-y equation: 


Simplifying
21 + 3x = -1y

Solving
21 + 3x = -1y

Solving for variable 'x'.

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

Add '-21' to each side of the equation.
21 + -21 + 3x = -21 + -1y

Combine like terms: 21 + -21 = 0
0 + 3x = -21 + -1y
3x = -21 + -1y

Divide each side by '3'.
x = -7 + -0.3333333333y

Simplifying
x = -7 + -0.3333333333y

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