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x in (-oo:+oo)
13/2+2 = 3*x // - 3*x
13/2-(3*x)+2 = 0
13/2-3*x+2 = 0
17/2-3*x = 0 // - 17/2
-3*x = -17/2 // : -3
x = -17/2/(-3)
x = 17/6
x = 17/6
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