12=y-21

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Solution for 12=y-21 equation:


Simplifying
12 = y + -21

Reorder the terms:
12 = -21 + y

Solving
12 = -21 + 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.
12 + -1y = -21 + y + -1y

Combine like terms: y + -1y = 0
12 + -1y = -21 + 0
12 + -1y = -21

Add '-12' to each side of the equation.
12 + -12 + -1y = -21 + -12

Combine like terms: 12 + -12 = 0
0 + -1y = -21 + -12
-1y = -21 + -12

Combine like terms: -21 + -12 = -33
-1y = -33

Divide each side by '-1'.
y = 33

Simplifying
y = 33

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