y+2y+(-y)=18

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Solution for y+2y+(-y)=18 equation: 


Simplifying
y + 2y + (-1y) = 18

Combine like terms: y + 2y = 3y
3y + (-1y) = 18

Combine like terms: 3y + (-1y) = 2y
2y = 18

Solving
2y = 18

Solving for variable 'y'.

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

Divide each side by '2'.
y = 9

Simplifying
y = 9

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