3)4/7(7/20-7/8)=у+3/8
У+3/8=1/5-1/2
У=1/5-1/2-3/8
У=8/40-20/40-15/40
У=-27/40
4)-9(5/6-8/9)=3/4+у
-15/2-8=3/4+у
0,75+у=-7,5-8
0,75+у=-15,5
У=-15,5-0,75
У=-16, 25
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3)4/7(7/20-7/8)=у+3/8
У+3/8=1/5-1/2
У=1/5-1/2-3/8
У=8/40-20/40-15/40
У=-27/40
4)-9(5/6-8/9)=3/4+у
-15/2-8=3/4+у
0,75+у=-7,5-8
0,75+у=-15,5
У=-15,5-0,75
У=-16, 25