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Simplifying
(2x2 + -18) = 0
Reorder the terms:
(-18 + 2x2) = 0
Remove parenthesis around (-18 + 2x2)
-18 + 2x2 = 0
Solving
-18 + 2x2 = 0
Solving for variable 'x'.
Move all terms containing x to the left, all other terms to the right.
Add '18' to each side of the equation.
-18 + 18 + 2x2 = 0 + 18
Combine like terms: -18 + 18 = 0
0 + 2x2 = 0 + 18
2x2 = 0 + 18
Combine like terms: 0 + 18 = 18
2x2 = 18
Divide each side by '2'.
x2 = 9
Simplifying
x2 = 9
Take the square root of each side:
x = {-3, 3}
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