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(x + 5)
Así:
4 + 5 = 9
9 + 5 = 14
14 + 5 = 19
19 + 5 = 24
24 + 5 = 29
y así sucesivamente.
Entonces te queda así:
4 + 9 + 14 + 19 + 24 + 29 + 34 + 39 + 44 + 49 + 54 + 59 + 64 + 69 + 74 + 79 + 84 + 89 + 94 + 99 + 104