Odpowiedź:
g) 2x +10 = 30/-10
2x = 20
x = 10
h) (x + 5): 2 = 4/*2
x + 5 = 8/-5
x = 3
i) 3x + 15 = 21/-15
3x = 6
x = 2
j) 6x - 4 - 4x + 10 = 12
2x + 6 = 12/ -6
2x = 6
k) x:3 + 1 = 6/-1
x : 3 = 5/*3
x = 15