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1/2･x +5 >(4x-3)/5
両辺を10倍する
5x + 50 > 8x -6
両辺に6を足す
5x + 56 > 8x
両辺から5xを引く
56 > 3x
両辺を3で割る
56÷3 > x
56÷3 = 18あまり2 なので
自然数xの最大値は 18
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