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U7= 103
U10= 88
a+ 6b= 103
a+9b=88
________-
-3b=15
b=-5
cari a di suku 7
a+ 6b= 103
a+6(-5)=103
a-30=103
a=136
u1= a+(n-1)b
u1= 136+(1-1)-5
u1=136+(0×-5)
u1=136
semoga membantu jawaban ini