y-2x=21

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Solution for y-2x=21 equation: 


Simplifying
y + -2x = 21

Reorder the terms:
-2x + y = 21

Solving
-2x + 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.
-2x + y + -1y = 21 + -1y

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

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

Simplifying
x = -10.5 + 0.5y

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