Найдите корень уравнения: а) 4(0,2x-7)-5(0,3x+6)=5;
б) 22,4(5/16 x-3/7)-35,1(9/13 x-4/9)=-45,9;
в) 2/9 (0,45-2,7y)-2/17 (0,51-3,4y)=0,16.
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