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a+2b+a+6b=26
2a+8b=26
a+4b=13
U5=13
U1 x U5=39
a x 13= 39
a=3
a+4b=13
3+4b=13
4b=10
b=2,5
U7-U5= 2b =2,5 x 2= 5 jawabannya e