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x in (-oo:+oo)
-3*x-(7/2) = 17/2 // - 17/2
-3*x-(7/2)-(17/2) = 0
-3*x-7/2-17/2 = 0
-3*x-12 = 0 // + 12
-3*x = 12 // : -3
x = 12/(-3)
x = -4
x = -4
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