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Simplifying
-2u2 = -100
Solving
-2u2 = -100
Solving for variable 'u'.
Move all terms containing u to the left, all other terms to the right.
Divide each side by '-2'.
u2 = 50
Simplifying
u2 = 50
Take the square root of each side:
u = {-7.071067812, 7.071067812}
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