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133*20 = 20x+190
20x=2470
x=123,5
x+x+1+x+2+x+3+x+4+x+5+x+6 / 7=7x+21 / 7= x+3 = 123,5 + 3 = 126,5
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20x + 19/2 (1 + 19) = 133 . 20
20x + 190 = 2660
20x = 2470
x = 123,5
maka rata2 dari 7 bilangan asli pertama berurutan
= (x + x + 1 + ... + x + 6) / 7
= (7x + 21) / 7 = x + 3= 123,5 + 3 = 126,5