5r+(r/3)r=5.1

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Solution for 5r+(r/3)r=5.1 equation: 


r in (-oo:+oo)

(r/3)*r+5*r = 5.1 // - 5.1

(r/3)*r+5*r-5.1 = 0

1/3*r^2+5*r-5.1 = 0

DELTA = 5^2-(-5.1*1/3*4)

DELTA = 31.799999932

DELTA > 0

r = (31.799999932^(1/2)-5)/(1/3*2) or r = (-31.799999932^(1/2)-5)/(1/3*2)

r = 3/2*(31.799999932^(1/2)-5) or r = -3/2*(31.799999932^(1/2)+5)

r in { -3/2*(31.799999932^(1/2)+5), 3/2*(31.799999932^(1/2)-5) }

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