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(23x + (1+22)x22/2))/23 = 133
(23x + 23x11) / 23 = 133
x + 11 = 133
x = 133 - 11
x = 122
sehingga rata - rata 7 bil pertama adalah
= (122 + 123 + 124 + 125 + 126 + 127 + 128)/7
= 875/7
= 125