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x in (-oo:+oo)
(3/5)*((1/3)*x+5)+(1/3)*x+(1/3)*x+5 = x // - x
(3/5)*((1/3)*x+5)+(1/3)*x+(1/3)*x-x+5 = 0
3/5*(1/3*x+5)+x/3+x/3-x+5 = 0
(3/5*3*(1/3*x+5))/3+x/3+x/3+(3*(-x))/3+(3*5)/3 = 0
3/5*3*(1/3*x+5)+x+x+3*(-x)+3*5 = 0
8/5*x+x-3*x+9+15 = 0
13/5*x-3*x+9+15 = 0
9-2/5*x+15 = 0
24-2/5*x = 0
(24-2/5*x)/3 = 0
(24-2/5*x)/3 = 0 // * 3
24-2/5*x = 0
24-2/5*x = 0 // - 24
-2/5*x = -24 // : -2/5
x = -24/(-2/5)
x = 60
x = 60
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