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-3*x-(1/2) = 23/2 // - 23/2
-3*x-(1/2)-(23/2) = 0
-3*x-1/2-23/2 = 0
-3*x-12 = 0 // + 12
-3*x = 12 // : -3
x = 12/(-3)
x = -4
x = -4
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