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Mathhead
Nov 21, 2011, 04:48 PM
slove
5(-4x) 7x<4(7 4x)
Aurora2000
Nov 22, 2011, 02:44 AM
5(-4x)+7x<4(7+4x)

By direct computation, you have -20x+7x<28+16x, thus -29x<28, or x>-28/29.