x-y-21=0

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Solution for x-y-21=0 equation:


Simplifying
x + -1y + -21 = 0

Reorder the terms:
-21 + x + -1y = 0

Solving
-21 + x + -1y = 0

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 + x + 21 + -1y = 0 + 21

Reorder the terms:
-21 + 21 + x + -1y = 0 + 21

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

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

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

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

Simplifying
x = 21 + y

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