100-y+81=180

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Solution for 100-y+81=180 equation:


Simplifying
100 + -1y + 81 = 180

Reorder the terms:
100 + 81 + -1y = 180

Combine like terms: 100 + 81 = 181
181 + -1y = 180

Solving
181 + -1y = 180

Solving for variable 'y'.

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

Add '-181' to each side of the equation.
181 + -181 + -1y = 180 + -181

Combine like terms: 181 + -181 = 0
0 + -1y = 180 + -181
-1y = 180 + -181

Combine like terms: 180 + -181 = -1
-1y = -1

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

Simplifying
y = 1

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