Harp has accumulated a certain amount of money. One day his father gave the harp is 600 baht day harp to buy food for cats and birds that feed into the 420 baht harp know the rest amount is less than half the amount of the harp, and the money I make as well. Determine whether the instrument has accumulated at least a few baht. To make the harp has accumulated x baht. Money Pirongrong and by the father, as well as x + 600 baht. After harp to buy food for cats and birds 420 baht discount. The money is less than half of x + 600 baht. 'll inequality is
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