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x in (-oo:+oo)
-5*x-(7/2) = 23/2 // - 23/2
-5*x-(7/2)-(23/2) = 0
-5*x-7/2-23/2 = 0
-5*x-15 = 0 // + 15
-5*x = 15 // : -5
x = 15/(-5)
x = -3
x = -3
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