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(x-3+10)/(x+10)=2(x+3)/x
D=R+
(x+7)*x=2(x-3)(x+10)
x²+7x=2(x²+7x-30)
x²+7x-60=0
Δ=49+240=289
√Δ=17
x=(-7-17)/2=-12<0
x=(-7+17)/2=5
x∈{5}
Szukany ułamek 2/5