Ответы на вопрос:
7/13 * (26/21 + х) - 28/54 : 14/27 = - 11/117 7/13 * (26/21 + х) - 28/54 * 27/14 = - 11/117 7/13 * (26/21 + х) - 1 = - 11/117 7/13 * (26/21 + х) = - 11/117 + 1 = (117-11)/117 = 106/117 26/21 + х = 106/117 : 7/13 = 106/117 * 13/7 = 106/63 х = 26/21 - 106/63 = (78-106)/63 = -28/63 = -4/9
96х-89х+397=600 96х-89х = 600 -397 7х = 203 х = 29 (3х+2х) *8=6400 5х*8 = 6400 5х = 6400\8 5х = 800 х = 160 \- разделить
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