1. -8 - a + a+23 = -8+23 = 15

1,3 + m + (-4-m) = -2,7

p - m + k + (-p + m + k) = 2k

3,7-2,6+4,2 + (-12,5+2,6-4,2) = 5,3+(-14,1) = -8,8

2. 7x-18x+25x-6x = 8x

-0,3b-1,4b+3,1b+0,7b = -1,7b+3,1b+0,7b = 1,7b+3,8b = -2,1b

11a-16b-18a+9b = -7a-7b

-0,8k+0,9p-1,7k+0,5k+1,4p = -2k+2,3p

3. -4x-8(9-2x) = -4x-72+16x

12x-72 = 0

x = 72/12

x = 6

3) 6(3x-2)+4(5x-1) = 18x-12+20x-4 = 38x-16

x = 16/38

x = 1/2

x = 0,5