(4 1/2-2x)*3 2/3=11/15
(9/2-2x)*11/3=11/15
99/6-22/3x=11/15
-22/3x=-99/6+11/15
22/3x=495/30-22/30
22/3x=473/30
x=473/30:22/3
х=473/220
х=43/20
(10 2/5+х): 1 1/7=9 1/3
(52/5+х):8/7=28/3
91/10+7/8х=28/3
7/8х=28/3-91/10
7/8х=280/30-273/30
7/8х=7/30
х=7/30:7/8
х=4/15