d5 = d3 + 2x (x - разность прогрессии)
18 + 2х = 22
2х = 4
х = 2
d4 = d3 + x = 18 + 2 = 20
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d5 = d3 + 2x (x - разность прогрессии)
18 + 2х = 22
2х = 4
х = 2
d4 = d3 + x = 18 + 2 = 20