3=y-21

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Solution for 3=y-21 equation:


Simplifying
3 = y + -21

Reorder the terms:
3 = -21 + y

Solving
3 = -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.
3 + -1y = -21 + y + -1y

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

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

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

Combine like terms: -21 + -3 = -24
-1y = -24

Divide each side by '-1'.
y = 24

Simplifying
y = 24

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