X+7×4 = 40. 80-x = 9×5. х-32:4=50
x+28 = 40. 80-x = 45. х-8=50
x тен 40-28. х = 80-45. х=50+8
x = 12. х = 35. х=58
12+7×4 = 40. 80-35 = 9×5. 58-32:4=50
6×3+х=72. 12+х=5×8. х+2×6=50
18+х=72. 12+х=40. х+18=50
х= 72-18. х=40-12. х=50-18
х=54. х=28. х=32