1+6+11+....+x=342
n>0
n1=(3-117)/10 n jest ujemne
n2=120/10=12
a12=1+(12-1)*5
a12=1+55=56
x=56
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n>0
n1=(3-117)/10 n jest ujemne
n2=120/10=12
a12=1+(12-1)*5
a12=1+55=56
x=56