81=(-5y+9)2

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Solution for 81=(-5y+9)2 equation:


Simplifying
81 = (-5y + 9) * 2

Reorder the terms:
81 = (9 + -5y) * 2

Reorder the terms for easier multiplication:
81 = 2(9 + -5y)
81 = (9 * 2 + -5y * 2)
81 = (18 + -10y)

Solving
81 = 18 + -10y

Solving for variable 'y'.

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

Add '10y' to each side of the equation.
81 + 10y = 18 + -10y + 10y

Combine like terms: -10y + 10y = 0
81 + 10y = 18 + 0
81 + 10y = 18

Add '-81' to each side of the equation.
81 + -81 + 10y = 18 + -81

Combine like terms: 81 + -81 = 0
0 + 10y = 18 + -81
10y = 18 + -81

Combine like terms: 18 + -81 = -63
10y = -63

Divide each side by '10'.
y = -6.3

Simplifying
y = -6.3

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