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x in (-oo:+oo)
3*(x+3) = x/5 // - x/5
3*(x+3)-(x/5) = 0
3*(x+3)-x/5 = 0
(3*5*(x+3))/5-x/5 = 0
3*5*(x+3)-x = 0
14*x+45 = 0
(14*x+45)/5 = 0
(14*x+45)/5 = 0 // * 5
14*x+45 = 0
14*x+45 = 0 // - 45
14*x = -45 // : 14
x = -45/14
x = -45/14
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