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x in (-oo:+oo)
7/2 = (5/2)*x // - (5/2)*x
7/2-((5/2)*x) = 0
(-5/2)*x+7/2 = 0
7/2-5/2*x = 0 // - 7/2
-5/2*x = -7/2 // : -5/2
x = -7/2/(-5/2)
x = 7/5
x = 7/5
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