15=-3x+21y

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Solution for 15=-3x+21y equation: 


Simplifying
15 = -3x + 21y

Solving
15 = -3x + 21y

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.
15 + 3x = -3x + 3x + 21y

Combine like terms: -3x + 3x = 0
15 + 3x = 0 + 21y
15 + 3x = 21y

Add '-15' to each side of the equation.
15 + -15 + 3x = -15 + 21y

Combine like terms: 15 + -15 = 0
0 + 3x = -15 + 21y
3x = -15 + 21y

Divide each side by '3'.
x = -5 + 7y

Simplifying
x = -5 + 7y

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