120+50=170
170+100=270
120+50+100=270
(5/8y-2 3/4)*8=3
5/8y-2 3/4=3/8
5/8y=3/8+2 3/4 =3/8+11/4=(3+22)/8=25/8
5/8y=25/8
y=25/8:5/8 = 25/8*8/5=5
y=5
(44×а)+9=20
44а+9=20
44а=20-9
44а=11
а=0,25