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x in (-oo:+oo)
25 = (1/5)*x // - (1/5)*x
25-((1/5)*x) = 0
(-1/5)*x+25 = 0
25-1/5*x = 0 // - 25
-1/5*x = -25 // : -1/5
x = -25/(-1/5)
x = 125
x = 125
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