3y+9-21=0

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Solution for 3y+9-21=0 equation: 


Simplifying
3y + 9 + -21 = 0

Reorder the terms:
9 + -21 + 3y = 0

Combine like terms: 9 + -21 = -12
-12 + 3y = 0

Solving
-12 + 3y = 0

Solving for variable 'y'.

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

Add '12' to each side of the equation.
-12 + 12 + 3y = 0 + 12

Combine like terms: -12 + 12 = 0
0 + 3y = 0 + 12
3y = 0 + 12

Combine like terms: 0 + 12 = 12
3y = 12

Divide each side by '3'.
y = 4

Simplifying
y = 4

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