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3r=8-2
3r=6 /:3
r=2
x-3=2+2
x=4+3
x=7
a2 = x - 3
a4 = 8
an = a1 + (n - 1) * r
a4 = a1 + (4 - 1) * r
a4 = a1 + 3r
8 = 2 + 3r
8 - 2 = 3r
3r = 6
r = 2
a2 = a1 + r
x - 3 = 2 + 2
x = 4 + 3
x = 7 ------------ odpowiedź