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U9=23 a+8b=23
-------------- -
-6b= -12
b= 2
b=2 a+2x2=11
a+4=11
a=11-4=7
S25=25/2(2x7+(25-1)2)
25/2(14+(24)2)
25/2(14+48)
25/2(62)
25x31=775
mungkin seperti itu :)