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x in (-oo:+oo)
-3*x-(5/2) = 7/2 // - 7/2
-3*x-(5/2)-(7/2) = 0
-3*x-5/2-7/2 = 0
-3*x-6 = 0 // + 6
-3*x = 6 // : -3
x = 6/(-3)
x = -2
x = -2
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