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x in (-oo:+oo)
(3/5)*(10-(5*x))+(5/3)*x = -2 // + 2
(3/5)*(10-(5*x))+(5/3)*x+2 = 0
(3/5)*(10-5*x)+(5/3)*x+2 = 0
3/5*(10-5*x)+(5*x)/3+2 = 0
(3/5*3*(10-5*x))/3+(5*x)/3+(2*3)/3 = 0
3/5*3*(10-5*x)+5*x+2*3 = 0
6-4*x+18 = 0
24-4*x = 0
(24-4*x)/3 = 0
(24-4*x)/3 = 0 // * 3
24-4*x = 0
24-4*x = 0 // - 24
-4*x = -24 // : -4
x = -24/(-4)
x = 6
x = 6
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