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x in (-oo:+oo)
4 = (5/2)*x-4 // - (5/2)*x-4
4-((5/2)*x)+4 = 0
(-5/2)*x+4+4 = 0
8-5/2*x = 0 // - 8
-5/2*x = -8 // : -5/2
x = -8/(-5/2)
x = 16/5
x = 16/5
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