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Simplifying
2x2 + 12 = 864
Reorder the terms:
12 + 2x2 = 864
Solving
12 + 2x2 = 864
Solving for variable 'x'.
Move all terms containing x to the left, all other terms to the right.
Add '-12' to each side of the equation.
12 + -12 + 2x2 = 864 + -12
Combine like terms: 12 + -12 = 0
0 + 2x2 = 864 + -12
2x2 = 864 + -12
Combine like terms: 864 + -12 = 852
2x2 = 852
Divide each side by '2'.
x2 = 426
Simplifying
x2 = 426
Take the square root of each side:
x = {-20.639767441, 20.639767441}
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