3x + 1 / 2 < −x + 4
3/2x + 1 / 2 < −x + 4
3/2x + 1/2 + x < −x + 4 + x
5/2x + 1/2 < 4
5/2x + 1/2 − 1/2 < 4 − 1/2
5/2x < 7/2
(2/5)*(5/2x) < (2/5)*(7/2)
x < 7/5
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