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2+4= 6 - U1 =5
U1+u3 = 4
jadi jawabannha 5/4
2a+2b= 5 dikali 4 juga
a+1b+a+3b= 5/4
2a+4b=5/4
supaya sama dikali 4 bawanya/penyebutnya
8a+8b=20
8a+16b=5
-8b=-15
b= 15/8
2a+15/2= 5/4
2a=5/4-30/4
2a= -25/4
a= -25/8
u5= a+4b= -25/8+15/2
= -25/8+ 60/8
= 35/8