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Given inequality is:
-3<4 - 7x/2 < 18
=> -3 -4 < -7x/2 < 18-4
=> -7 < -7x/2 < 14
=> -14 < 7x/2 < 7
=> -14*2 < 7x < 7*2
=> -28 < 7x < 14
=< -28/7 < x < 14/2
=< -4 < x < 2