x=x.f/f
7=(198+8x)/(30+x)
210+7x =198+8x
210 -198=x
12 =x
jadi jumlah x sebesar 12
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x=x.f/f
7=(198+8x)/(30+x)
210+7x =198+8x
210 -198=x
12 =x
jadi jumlah x sebesar 12