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Simplifying
20n2 + -180 = 0
Reorder the terms:
-180 + 20n2 = 0
Solving
-180 + 20n2 = 0
Solving for variable 'n'.
Move all terms containing n to the left, all other terms to the right.
Add '180' to each side of the equation.
-180 + 180 + 20n2 = 0 + 180
Combine like terms: -180 + 180 = 0
0 + 20n2 = 0 + 180
20n2 = 0 + 180
Combine like terms: 0 + 180 = 180
20n2 = 180
Divide each side by '20'.
n2 = 9
Simplifying
n2 = 9
Take the square root of each side:
n = {-3, 3}
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