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x in (-oo:+oo)
3*x+5 = 13/2 // - 13/2
3*x-(13/2)+5 = 0
3*x-13/2+5 = 0
3*x-3/2 = 0 // + 3/2
3*x = 3/2 // : 3
x = 3/2/3
x = 1/2
x = 1/2
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