21=3y-6

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Solution for 21=3y-6 equation:


Simplifying
21 = 3y + -6

Reorder the terms:
21 = -6 + 3y

Solving
21 = -6 + 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 = -6 + 3y + -3y

Combine like terms: 3y + -3y = 0
21 + -3y = -6 + 0
21 + -3y = -6

Add '-21' to each side of the equation.
21 + -21 + -3y = -6 + -21

Combine like terms: 21 + -21 = 0
0 + -3y = -6 + -21
-3y = -6 + -21

Combine like terms: -6 + -21 = -27
-3y = -27

Divide each side by '-3'.
y = 9

Simplifying
y = 9

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