8/100+х=90/100
х=90/100-8/100
х=82/100
60/90-(6/90+х)=29/90
6/90+х=60/90-29/90
6/90+х=31/90
х=31/90-6/90
х=25/90
8/100+х=90/100
х=90/100-8/100
х=82/100
60/90-(6/90+х)=29/90
6/90+х=60/90-29/90
6/90+х=31/90
х=31/90-6/90
х=25/90