Найдите корни данных уравнений: а)5x+18=2(x+6)+2+27, б) 3x-20=2(x-1), в) 3( 2а+3)-4а=3(а-1),г)4(2у-5)-13=3у-3. Проверь ответы:6, 12,18,21.​
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