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x in (-oo:+oo)
-5 = (7/2)*x // - (7/2)*x
-((7/2)*x)-5 = 0
(-7/2)*x-5 = 0
-7/2*x-5 = 0 // + 5
-7/2*x = 5 // : -7/2
x = 5/(-7/2)
x = -10/7
x = -10/7
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