81=180-(100-y)

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Solution for 81=180-(100-y) equation:


Simplifying
81 = 180 + -1(100 + -1y)
81 = 180 + (100 * -1 + -1y * -1)
81 = 180 + (-100 + 1y)

Combine like terms: 180 + -100 = 80
81 = 80 + 1y

Solving
81 = 80 + 1y

Solving for variable 'y'.

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

Add '-1y' to each side of the equation.
81 + -1y = 80 + 1y + -1y

Combine like terms: 1y + -1y = 0
81 + -1y = 80 + 0
81 + -1y = 80

Add '-81' to each side of the equation.
81 + -81 + -1y = 80 + -81

Combine like terms: 81 + -81 = 0
0 + -1y = 80 + -81
-1y = 80 + -81

Combine like terms: 80 + -81 = -1
-1y = -1

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

Simplifying
y = 1

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