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Simplifying
3x2 + -125 = 0
Reorder the terms:
-125 + 3x2 = 0
Solving
-125 + 3x2 = 0
Solving for variable 'x'.
Move all terms containing x to the left, all other terms to the right.
Add '125' to each side of the equation.
-125 + 125 + 3x2 = 0 + 125
Combine like terms: -125 + 125 = 0
0 + 3x2 = 0 + 125
3x2 = 0 + 125
Combine like terms: 0 + 125 = 125
3x2 = 125
Divide each side by '3'.
x2 = 41.66666667
Simplifying
x2 = 41.66666667
Take the square root of each side:
x = {-6.454972244, 6.454972244}
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