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x in (-oo:+oo)
5 = (1/5)*x-3 // - (1/5)*x-3
3-((1/5)*x)+5 = 0
(-1/5)*x+3+5 = 0
8-1/5*x = 0 // - 8
-1/5*x = -8 // : -1/5
x = -8/(-1/5)
x = 40
x = 40
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