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x in (-oo:+oo)
-3*x-(5/2) = 25/2 // - 25/2
-3*x-(5/2)-(25/2) = 0
-3*x-5/2-25/2 = 0
-3*x-15 = 0 // + 15
-3*x = 15 // : -3
x = 15/(-3)
x = -5
x = -5
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