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x in (-oo:+oo)
1/5-(x/3) = 13/15 // - 13/15
1/5-(x/3)-(13/15) = 0
1/5-(x/3)-13/15 = 0
-1/3*x-2/3 = 0 // + 2/3
-1/3*x = 2/3 // : -1/3
x = 2/3/(-1/3)
x = -2
x = -2
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