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x in (-oo:+oo)
(3*x+9)/5+3*x = 1 // - 1
(3*x+9)/5+3*x-1 = 0
(3*x+9)/5+(3*5*x)/5+(-1*5)/5 = 0
3*x+3*5*x-1*5+9 = 0
18*x-5+9 = 0
18*x+4 = 0
(18*x+4)/5 = 0
(18*x+4)/5 = 0 // * 5
18*x+4 = 0
18*x+4 = 0 // - 4
18*x = -4 // : 18
x = -4/18
x = -2/9
x = -2/9
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