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U5+U7=114
U3=a+2b=36
U5+U7=a+4b+a+6b=114-->2a+10b=114
dibuat eliminasi :
2a+10b=114
2a+4b=72
b=7-->a+2.7=36
a=22
S10=10/2(2.22+9.7)
=5(44+63)
=5.107
=535