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