-21+30=-3y

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Solution for -21+30=-3y equation:


Simplifying
-21 + 30 = -3y

Combine like terms: -21 + 30 = 9
9 = -3y

Solving
9 = -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.
9 + 3y = -3y + 3y

Combine like terms: -3y + 3y = 0
9 + 3y = 0

Add '-9' to each side of the equation.
9 + -9 + 3y = 0 + -9

Combine like terms: 9 + -9 = 0
0 + 3y = 0 + -9
3y = 0 + -9

Combine like terms: 0 + -9 = -9
3y = -9

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

Simplifying
y = -3

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