8b+55=167; 8b=167-55; 8b=112; b=112:8=14. 7у+9-5у=13; 2у=13-9; 2у=4; у=4:2=2. (720+С)×501=365730; 720+С=365730:501; 720+С=730; С=730-720=10. (k+2958):87=134; k+2958=134×87; k+2958=11658; k=11658-2958=8700. б) 8с-14=6с+4; 8с-6с=4+14; 2с=18; С=18:2=9. (с-3)×12=20-4(с+2); 12с-36=20-4с-8; 12с+4с=12+36; 16с=48; С=48:16=3