-21=6-3y

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Solution for -21=6-3y equation:


Simplifying
-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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