81-y=8y-18

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Solution for 81-y=8y-18 equation:


Simplifying
81 + -1y = 8y + -18

Reorder the terms:
81 + -1y = -18 + 8y

Solving
81 + -1y = -18 + 8y

Solving for variable 'y'.

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

Add '-8y' to each side of the equation.
81 + -1y + -8y = -18 + 8y + -8y

Combine like terms: -1y + -8y = -9y
81 + -9y = -18 + 8y + -8y

Combine like terms: 8y + -8y = 0
81 + -9y = -18 + 0
81 + -9y = -18

Add '-81' to each side of the equation.
81 + -81 + -9y = -18 + -81

Combine like terms: 81 + -81 = 0
0 + -9y = -18 + -81
-9y = -18 + -81

Combine like terms: -18 + -81 = -99
-9y = -99

Divide each side by '-9'.
y = 11

Simplifying
y = 11

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