x^2/15+x/5-2/3=0

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Solution for x^2/15+x/5-2/3=0 equation: 


x in (-oo:+oo)

(x^2)/15+x/5-(2/3) = 0

(x^2)/15+x/5-2/3 = 0

1/15*x^2+1/5*x-2/3 = 0

DELTA = (1/5)^2-(-2/3*1/15*4)

DELTA = 49/225

DELTA > 0

x = ((49/225)^(1/2)-1/5)/(1/15*2) or x = (-(49/225)^(1/2)-1/5)/(1/15*2)

x = 2 or x = -5

x in { -5, 2 }

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