0.8(5-x)-1.2(x+4)=-2.8
4 – 0.8x – 1.2x – 4.8 = – 2.8
– 0,8x – 1,2x = – 2,8 + 4,8 – 4
-2x = -2
x = 1
1.4(3-x)-0.9(x+2)=4.7
4.2 – 1.4x – 0.9x – 1.8 = 4.7
– 1,4x – 0,9x = 4,7 + 1,8 – 4,2
-2.3x = 2.3
x = -1
0.8(5-x)-1.2(x+4)=-2.8
4 – 0.8x – 1.2x – 4.8 = – 2.8
– 0,8x – 1,2x = – 2,8 + 4,8 – 4
-2x = -2
x = 1
1.4(3-x)-0.9(x+2)=4.7
4.2 – 1.4x – 0.9x – 1.8 = 4.7
– 1,4x – 0,9x = 4,7 + 1,8 – 4,2
-2.3x = 2.3
x = -1