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B. 2y+4<12 = 2y<-4+12 = 2y<8 = y<8/2 = y<4
C. 5x+2=4x-1 = 5x-4x=-2-1 = x=-3
D. 2(2y-1)<3(2y+3) = 4y-2<6y+9 = 4y-6y<2+9 = -2y<11 = y<11/-2 = y>-5,5
pda pertidaksamaan jika hurufnya negatif maka jwb.an akhir tanda pertidaksamaan dibalik
(maaf jka slah)