Răspuns:
Explicație pas cu pas:
9/5(7/4·3/7-10x/9)=1/3·9/20
7/4·3/7-10x/9=1/12 3/4-10x/9=1/12 27-40x=36/12
27-40x=3 40x=27-3 40x=24 ⇒x=24/40=3/5
x=3/5