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x in (-oo:+oo)
-3*x-(5/2) = 13/2 // - 13/2
-3*x-(5/2)-(13/2) = 0
-3*x-5/2-13/2 = 0
-3*x-9 = 0 // + 9
-3*x = 9 // : -3
x = 9/(-3)
x = -3
x = -3
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