261=138-y

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Solution for 261=138-y equation:


Simplifying
261 = 138 + -1y

Solving
261 = 138 + -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.
261 + y = 138 + -1y + y

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

Add '-261' to each side of the equation.
261 + -261 + y = 138 + -261

Combine like terms: 261 + -261 = 0
0 + y = 138 + -261
y = 138 + -261

Combine like terms: 138 + -261 = -123
y = -123

Simplifying
y = -123

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