3y-9=-30

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Solution for 3y-9=-30 equation: 


Simplifying
3y + -9 = -30

Reorder the terms:
-9 + 3y = -30

Solving
-9 + 3y = -30

Solving for variable 'y'.

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

Add '9' to each side of the equation.
-9 + 9 + 3y = -30 + 9

Combine like terms: -9 + 9 = 0
0 + 3y = -30 + 9
3y = -30 + 9

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

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

Simplifying
y = -7

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