Пошаговое объяснение:
х * 5 = 420
х = 420 : 5
х = 84
6х = 1830
х = 1830 : 6
х = 305
13 = 7х
-7х = -13
х = -13/-7
х = 13/7
х = 1 6/7
4278 = х * 13
4278 = 13х
-13х = -4278
х = -4278 : (-13)
х = 4278/13
х = 329 1/13
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Пошаговое объяснение:
х * 5 = 420
х = 420 : 5
х = 84
6х = 1830
х = 1830 : 6
х = 305
13 = 7х
-7х = -13
х = -13/-7
х = 13/7
х = 1 6/7
4278 = х * 13
4278 = 13х
-13х = -4278
х = -4278 : (-13)
х = 4278/13
х = 329 1/13