7,4a+2,6 b-2,5a+3,7 b=(7,4a-2,5a)+(2,6b+3,7b) = 4,9a+6,3b
5(2а+1)-3=10а+5-3=10а+2
14x-(x-1)+(2x+6)=14x-x+1+2x+6=15x+7
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7,4a+2,6 b-2,5a+3,7 b=(7,4a-2,5a)+(2,6b+3,7b) = 4,9a+6,3b
5(2а+1)-3=10а+5-3=10а+2
14x-(x-1)+(2x+6)=14x-x+1+2x+6=15x+7