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x=1/6s
x:s=1:6 selisih perbandingan 5
x=1/5*30=6
s=6/5*30=36
x/t=6/7
6/y=6/7
y=7
t=s/t=x/y
36/t=6/7
6t=7*36
6t=252
t=252/6
t=42