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x in (-oo:+oo)
25/5 = (1/5)*x // - (1/5)*x
25/5-((1/5)*x) = 0
(-1/5)*x+25/5 = 0
5-1/5*x = 0 // - 5
-1/5*x = -5 // : -1/5
x = -5/(-1/5)
x = 25
x = 25
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