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x in (-oo:+oo)
x/5+1 = 3*x-13 // - 3*x-13
x/5-(3*x)+1+13 = 0
x/5-3*x+1+13 = 0
14-14/5*x = 0 // - 14
-14/5*x = -14 // : -14/5
x = -14/(-14/5)
x = 5
x = 5
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