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x in (-oo:+oo)
(2/2)*x-5 = 3*x+1 // - 3*x+1
(2/2)*x-(3*x)-5-1 = 0
(2/2)*x-3*x-5-1 = 0
-2*x-6 = 0 // + 6
-2*x = 6 // : -2
x = 6/(-2)
x = -3
x = -3
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