138-y=255

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Solution for 138-y=255 equation: 


Simplifying
138 + -1y = 255

Solving
138 + -1y = 255

Solving for variable 'y'.

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

Add '-138' to each side of the equation.
138 + -138 + -1y = 255 + -138

Combine like terms: 138 + -138 = 0
0 + -1y = 255 + -138
-1y = 255 + -138

Combine like terms: 255 + -138 = 117
-1y = 117

Divide each side by '-1'.
y = -117

Simplifying
y = -117

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