Реши уравнение: а) 12,78х+3,84х+2,22х+1,16х-0,3х=197
б) 5,25х+7,56х+4,98х-1,25х+0,02х=1,656
в) 0,75х+3,8х+0,25х+1,2х+9,84х=15,84
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