0,8x+1,4=0,4x-2,6
0,18x-3,54=0,19x-2,89
2 2/3x+3 2/15 = 3 1/5x+2 1/3

1) 0.8x+1.4 =0.4x -2.60.8x -0.4x = -2.6 -1.40.4x = -4x= -4/0.4x = -102) 0.18x -3.54 =0.19x -2.890.18x -0.19x = -2.89 +3.54-0.01x =0.65x = -653) 2 2/3 =8/33 2/15 =47/153 1/5 =16/52 1/3 =7/38/3x +47/15 =16/5x +7/38/3x -16/5x =7/3 -47/15(8*5 -16*3)/15x =(7*5-47)/15(40-48)/15x =(35-47)/15-8/15x = -12/15x =12/15 : 8/15x =12/15 * 15/8x =(12*15)/(15*8)x =12/8x =3/2x =1.5