7,8a+2,3a-5a=(7,8+2,3-5)а=5,1а
При а=6: 5.1а=5.1*6=30.6
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7,8a+2,3a-5a=(7,8+2,3-5)а=5,1а
При а=6: 5.1а=5.1*6=30.6