Question

40/x+(130-40)/(X+10）=5

Answer 1

40/x+(130-40)/(X+10）=5

40*(X+10）+ 90*x=5*x*(X+10）

40x+400 +90x=5x^2+50x

5x^2-80x-400=0

x^2-16x-80=0

(x-8)^2=144

x-8=+12,-12

x=-4 x=20