54 / (16.5+x) + 30 / (16.5-x) = 5

решить уравнение

54 / (16.5+x) + 30 / (16.5-x) = 5

54 (16.5-x) + 30 (16.5+x) = 5 (16.5+x) (16.5-x)

891-54x+495+30x=5 (272.25-x ²)

891-54x+495+30x-1361.25+5x²=0

5x^2-24x+24.75=

D = (-24) ²-4*5*24.75=576-495=81

√81=9

x₁ = (24+9) / 2*5=3.3

x₂ = (24-9) / 2*5=1.5