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x in (-oo:+oo)
3 = (1/5)*x // - (1/5)*x
3-((1/5)*x) = 0
(-1/5)*x+3 = 0
3-1/5*x = 0 // - 3
-1/5*x = -3 // : -1/5
x = -3/(-1/5)
x = 15
x = 15
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