(4/15+3/10): 13/6 3/4(2-×)=7/8 5/3(×-6/7)=1/14

(4/15+3/10):13/6=(8/30+9/30):13/6=17/30*6/13=17/65

3/4(2-х)=7/8
2-х=7/8*4/3=7/6
х=2-7/6
х=12/6-7/6
х=5/6

5/3(х-6/7)=1/14
х-6/7=1/14*3/5
х-6/7=3/70
х=3/70+6/7
х=3/70+60/70
х=63/70
х=9/10
х=0,9