First, find a common denominator, which in this case is 270.
In order to get 270 in the denominator, we must also multiply the numerator by the same amount.
Thus, 8*10/27*10+7*6/45*6+3*27/10*27 = 80/270+42/270+81/270
Therefore, 161/270+42/270 = 203/270
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