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7x + 8 + 5 < 2/3 x - 5 + 5
7x + 13 < 2/3 x kedua ruas dikurangi 7x
7x - 7x + 13 < 2/3x - 7x
13 < 2/3 x - 21/3 x
13 < - 19/3 x
39 < -19 x
39/19 > x