218=140-y

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Solution for 218=140-y equation:


Simplifying
218 = 140 + -1y

Solving
218 = 140 + -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.
218 + y = 140 + -1y + y

Combine like terms: -1y + y = 0
218 + y = 140 + 0
218 + y = 140

Add '-218' to each side of the equation.
218 + -218 + y = 140 + -218

Combine like terms: 218 + -218 = 0
0 + y = 140 + -218
y = 140 + -218

Combine like terms: 140 + -218 = -78
y = -78

Simplifying
y = -78

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