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x in (-oo:+oo)
13/195 = (1/5)*x // - (1/5)*x
13/195-((1/5)*x) = 0
(-1/5)*x+13/195 = 0
1/15-1/5*x = 0 // - 1/15
-1/5*x = -1/15 // : -1/5
x = -1/15/(-1/5)
x = 1/3
x = 1/3
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