4) (9.2х+у)-(5.5х+8у)-4=9.2х+у-5.5х-8у = 3.7х-7у
5) -1.4(5а-7)+8(0.5а+2)=-7а+49/5+4а+16= -3а+25.8
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4) (9.2х+у)-(5.5х+8у)-4=9.2х+у-5.5х-8у = 3.7х-7у
5) -1.4(5а-7)+8(0.5а+2)=-7а+49/5+4а+16= -3а+25.8