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x in (-oo:+oo)
13/5 = x/3 // - x/3
13/5-(x/3) = 0
13/5-1/3*x = 0 // - 13/5
-1/3*x = -13/5 // : -1/3
x = -13/5/(-1/3)
x = 39/5
x = 39/5
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