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(487 + 17∙х) : 19 = 33

(29 ∙х + 7) : 31 = 19

498 - 25347 : (150 - х) = 285

(487 + 17∙х) : 19 = 33

487+17 х=33*19

487+17 х=627

17 х=627-487

17 х=140

х=140/17=8 4/17

(29 ∙х + 7) : 31 = 19

29 х+7=19*31

29 х=589-7

29 х=582

х=582/29=20 2/29

498 - 25347 : (150 - х) = 285

25347: (150-х) = 213

150-х=25347:213

150-х=119

х=150-119

х=31