Решите уравнение: 1) 9x = -54; 4) -21x = 48; 7) x : (-1 3/13) = -0,26; 2) 1,2x = -6; 5) 2 1/7 х = -1 11/14; 8) 18 : (-x)

1) 9x = -54; х=-6; 4) -21x = 48; х=-48/21=-2 6/21=-2 2/7; 2) 1,2x = -6; х=-5; 5) 2 1/7 х = -1 11/14; х=-25/14 * 7/15=-5/2 * 1/3=-5/6; 3) 13x = -6; х=-6/13; 6) -3,78 : x = -0,6; х=-3,78 : (-0,6)=63;7) x : (-1 3/13) = -0,26; х=-26/100 * (-16/13)=-2/25 * (-4/1)=8/25;8) 18 : (-x) = 0,6; -х=18 : 0,6; -х=30; х=-30.