9*9+8y=72

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Solution for 9*9+8y=72 equation: 


Simplifying
9 * 9 + 8y = 72

Multiply 9 * 9
81 + 8y = 72

Solving
81 + 8y = 72

Solving for variable 'y'.

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

Add '-81' to each side of the equation.
81 + -81 + 8y = 72 + -81

Combine like terms: 81 + -81 = 0
0 + 8y = 72 + -81
8y = 72 + -81

Combine like terms: 72 + -81 = -9
8y = -9

Divide each side by '8'.
y = -1.125

Simplifying
y = -1.125

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