123-y=177

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Solution for 123-y=177 equation: 


Simplifying
123 + -1y = 177

Solving
123 + -1y = 177

Solving for variable 'y'.

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

Add '-123' to each side of the equation.
123 + -123 + -1y = 177 + -123

Combine like terms: 123 + -123 = 0
0 + -1y = 177 + -123
-1y = 177 + -123

Combine like terms: 177 + -123 = 54
-1y = 54

Divide each side by '-1'.
y = -54

Simplifying
y = -54

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