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x in (-oo:+oo)
-x/3 = 13/2 // - 13/2
-x/3-(13/2) = 0
-x/3-13/2 = 0
-1/3*x-13/2 = 0 // + 13/2
-1/3*x = 13/2 // : -1/3
x = 13/2/(-1/3)
x = -39/2
x = -39/2
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