3y+(-9y)=-18

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Solution for 3y+(-9y)=-18 equation: 


Simplifying
3y + (-9y) = -18

Combine like terms: 3y + (-9y) = -6y
-6y = -18

Solving
-6y = -18

Solving for variable 'y'.

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

Divide each side by '-6'.
y = 3

Simplifying
y = 3

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