254=139-y

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Solution for 254=139-y equation:


Simplifying
254 = 139 + -1y

Solving
254 = 139 + -1y

Solving for variable 'y'.

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

Add 'y' to each side of the equation.
254 + y = 139 + -1y + y

Combine like terms: -1y + y = 0
254 + y = 139 + 0
254 + y = 139

Add '-254' to each side of the equation.
254 + -254 + y = 139 + -254

Combine like terms: 254 + -254 = 0
0 + y = 139 + -254
y = 139 + -254

Combine like terms: 139 + -254 = -115
y = -115

Simplifying
y = -115

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