0=-3y-21

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Solution for 0=-3y-21 equation: 


Simplifying
0 = -3y + -21

Reorder the terms:
0 = -21 + -3y

Solving
0 = -21 + -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.
0 + 3y = -21 + -3y + 3y
Remove the zero:
3y = -21 + -3y + 3y

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

Divide each side by '3'.
y = -7

Simplifying
y = -7

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