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3r=a8-a5
3r=36-12
3r=24 /:3
r=8
a8 = 36
a5 = a1 + (5-1)d
12 = a1 +4d
a8 = a1 + (8-1)d
36 = a1 + 7d
12 = a1 + 4d
36 = a1 + 7d
-a1 = 4d - 12
-a1 = 7d - 36 | mnożę przez (-1)
-a1 = 4d - 12
a1 = -7d + 36
Dodajemy górę z dołem
0 = -3d + 24
3d = 24
d = 8