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