y-3x=-21

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Solution for y-3x=-21 equation: 


Simplifying
y + -3x = -21

Reorder the terms:
-3x + y = -21

Solving
-3x + y = -21

Solving for variable 'x'.

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

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

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

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

Simplifying
x = 7 + 0.3333333333y

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