21r/10=(90+r)*(110+r)

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Solution for 21r/10=(90+r)*(110+r) equation: 


r in (-oo:+oo)

(21*r)/10 = (r+90)*(r+110) // - (r+90)*(r+110)

(21*r)/10-((r+90)*(r+110)) = 0

(21*r)/10-1*(r+90)*(r+110) = 0

(-1*10*(r+90)*(r+110))/10+(21*r)/10 = 0

21*r-1*10*(r+90)*(r+110) = 0

-10*r^2-1979*r-99000 = 0

-10*r^2-1979*r-99000 = 0

-1*(10*r^2+1979*r+99000) = 0

10*r^2+1979*r+99000 = 0

DELTA = 1979^2-(4*10*99000)

DELTA = -43559

DELTA < 0

-1 = 0

-1/10 = 0

-1/10 = 0 // * 10

-1 = 0

r belongs to the empty set

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