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Simplifying
(3x2 + -18) + 90 = 180
Reorder the terms:
(-18 + 3x2) + 90 = 180
Remove parenthesis around (-18 + 3x2)
-18 + 3x2 + 90 = 180
Reorder the terms:
-18 + 90 + 3x2 = 180
Combine like terms: -18 + 90 = 72
72 + 3x2 = 180
Solving
72 + 3x2 = 180
Solving for variable 'x'.
Move all terms containing x to the left, all other terms to the right.
Add '-72' to each side of the equation.
72 + -72 + 3x2 = 180 + -72
Combine like terms: 72 + -72 = 0
0 + 3x2 = 180 + -72
3x2 = 180 + -72
Combine like terms: 180 + -72 = 108
3x2 = 108
Divide each side by '3'.
x2 = 36
Simplifying
x2 = 36
Take the square root of each side:
x = {-6, 6}
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