1) 4m - m + 4 + 5 - 2m = m + 9

m + 9 = m + 9

dokazano

2) 3n - 7n + 14 + 12 - 6n = 26 - 10n

-10n + 26 = 26 - 10n

26 - 10n = 26 - 10n

dokazano

3) 8 - 12p + 10 + 9p - 18 = -3p

-3p = -3p

dokazano