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x in (-oo:+oo)
0 = 10-((5/2)*x) // - 10-((5/2)*x)
(5/2)*x-10+0 = 0
(5/2)*x-10 = 0
5/2*x-10 = 0 // + 10
5/2*x = 10 // : 5/2
x = 10/5/2
x = 4
x = 4
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