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Ответ

Автор - uncl95

Ответ:

Пошаговое объяснение:

а)

у+74=172

у =172-74

у=98

б)

х+х+18=66

2х=66-18

2х=48

х=48:2

х=24

в)

86+35z=331

35z=331-86

35z=245

z=245:35

z=7

г)

2m-45=127

2m=127+45

2m=172

m=172:2

m=86

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