9r^2+5=-66

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Solution for 9r^2+5=-66 equation:


Simplifying
9r2 + 5 = -66

Reorder the terms:
5 + 9r2 = -66

Solving
5 + 9r2 = -66

Solving for variable 'r'.

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

Add '-5' to each side of the equation.
5 + -5 + 9r2 = -66 + -5

Combine like terms: 5 + -5 = 0
0 + 9r2 = -66 + -5
9r2 = -66 + -5

Combine like terms: -66 + -5 = -71
9r2 = -71

Divide each side by '9'.
r2 = -7.888888889

Simplifying
r2 = -7.888888889

Reorder the terms:
7.888888889 + r2 = -7.888888889 + 7.888888889

Combine like terms: -7.888888889 + 7.888888889 = 0.000000000
7.888888889 + r2 = 0.000000000

The solution to this equation could not be determined.

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