Ответ:
90х + 17 = 800 - 423
90х + 17 = 377
90х = 377 - 17
90х = 360
х = 360 : 90
х = 4
800-90х-17=423
-90х=423-800+17
-90х=-360
Х=4
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Ответ:
90х + 17 = 800 - 423
90х + 17 = 377
90х = 377 - 17
90х = 360
х = 360 : 90
х = 4
800-90х-17=423
-90х=423-800+17
-90х=-360
Х=4