Объяснение:

[tex]1)0.4(x - 1.2) + 1.6x = - 2 \\ 0.4x - 0.48 + 1.6x + 2 = 0 \\ 2x + 1.52 = 0 \\ 2x = - 1.52 \\ x = - 0.76 \\ 2.10x - 2.5(0.6x - 3) = - 1 \\ 10x - 1.5 x + 7.5 + 1 = 0 \\ 8.5x + 8.5 = 0 \\ 8.5x = - 8.5 \\ x = - 1 [/tex]