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100*x^2+16*x = -16/25 // + -16/25
100*x^2+16*x-(-16/25) = 0
100*x^2+16*x+16/25 = 0
100*x^2+16*x+16/25 = 0
DELTA = 16^2-(16/25*4*100)
DELTA = 0
x = -16/(2*100)
x = -2/25 or x = -2/25
x in { -2/25, -2/25 }
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