2.
[tex]a) \ 4z+2z+6z = 12z\\\\b) \ 5y+8y-11y = 13y-11y = 2y\\\\c) \ 2w-w-2w = 2w - 3w = -w\\\\d) \ x - 1,5x + 2x = 3x - 1,5x = 1,5x\\\\e) \ -x-3x+\frac{1}{7}x = -4x+\frac{1}{7}x = -3\frac{6}{7}x\\\\f) \ x+2x-0,4x = 3x - 0,4x = 2,6x[/tex]
