упрощаем: 5*(-2х-6)+2(5х+7)+3х= -10х-30+10х+14+3х=-16+3х=3х-16.
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упрощаем: 5*(-2х-6)+2(5х+7)+3х= -10х-30+10х+14+3х=-16+3х=3х-16.