-21=y-21

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Solution for -21=y-21 equation:


Simplifying
-21 = y + -21

Reorder the terms:
-21 = -21 + y

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

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

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

Solving
0 = y

Solving for variable 'y'.

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

Add '-1y' to each side of the equation.
0 + -1y = y + -1y
Remove the zero:
-1y = y + -1y

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

Divide each side by '-1'.
y = 0

Simplifying
y = 0

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