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30,5×2=(X+3)+(2x-1)+(3x-1)
61=x+3+2x-1+3x-1
61=x+2x+3x+3-1-1
61=6x+1
61-1=6x
60=6x
60:6=x
10=x
jadi x =10
sisi terpendek =AB=(x+3)
AB=(10+3)=13