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x in (-oo:+oo)
25 = (5/2)*x+20 // - (5/2)*x+20
25-((5/2)*x)-20 = 0
(-5/2)*x-20+25 = 0
5-5/2*x = 0 // - 5
-5/2*x = -5 // : -5/2
x = -5/(-5/2)
x = 2
x = 2
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