21=3y-24

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Solution for 21=3y-24 equation:


Simplifying
21 = 3y + -24

Reorder the terms:
21 = -24 + 3y

Solving
21 = -24 + 3y

Solving for variable 'y'.

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

Add '-3y' to each side of the equation.
21 + -3y = -24 + 3y + -3y

Combine like terms: 3y + -3y = 0
21 + -3y = -24 + 0
21 + -3y = -24

Add '-21' to each side of the equation.
21 + -21 + -3y = -24 + -21

Combine like terms: 21 + -21 = 0
0 + -3y = -24 + -21
-3y = -24 + -21

Combine like terms: -24 + -21 = -45
-3y = -45

Divide each side by '-3'.
y = 15

Simplifying
y = 15

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