-y=y+18

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Solution for -y=y+18 equation:


Simplifying
-1y = y + 18

Reorder the terms:
-1y = 18 + y

Solving
-1y = 18 + y

Solving for variable 'y'.

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

Add '-1y' to each side of the equation.
-1y + -1y = 18 + y + -1y

Combine like terms: -1y + -1y = -2y
-2y = 18 + y + -1y

Combine like terms: y + -1y = 0
-2y = 18 + 0
-2y = 18

Divide each side by '-2'.
y = -9

Simplifying
y = -9

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