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5х+1,8=7.9
5х=7.9-1.8
5х=6.1
х=6.1/5
х=1,22
8/11 и 5/8
НОЗ=88
64/88 и 55/88
3/22 и 2/33
НОЗ=66
9/66 и 4/66
2(целых)4/7 - 36= 2(целых)4/7 - 35 (целых) 7/7 = 33 (целых)3/7