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x in (-oo:+oo)
28 = 7-((3/2)*x) // - 7-((3/2)*x)
(3/2)*x-7+28 = 0
3/2*x+21 = 0 // - 21
3/2*x = -21 // : 3/2
x = -21/3/2
x = -14
x = -14
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