4s/7s-5-s/5-7s

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Solution for 4s/7s-5-s/5-7s equation: 


s in (-oo:+oo)

((4*s)/7)*s-(s/5)-(7*s)-5 = 0

((4*s)/7)*s-(s/5)-7*s-5 = 0

4/7*s^2-36/5*s-5 = 0

DELTA = (-36/5)^2-(-5*4/7*4)

DELTA = 11072/175

DELTA > 0

s = ((11072/175)^(1/2)+36/5)/(4/7*2) or s = (36/5-(11072/175)^(1/2))/(4/7*2)

s = 7/8*((11072/175)^(1/2)+36/5) or s = 7/8*(36/5-(11072/175)^(1/2))

s in { 7/8*(36/5-(11072/175)^(1/2)), 7/8*((11072/175)^(1/2)+36/5) }

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