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x in (-oo:+oo)
(3/5)*(x+4)+(1/2)*x = x+3 // - x+3
(3/5)*(x+4)+(1/2)*x-x-3 = 0
3/5*(x+4)+x/2-x-3 = 0
(3/5*2*(x+4))/2+x/2+(2*(-x))/2+(-3*2)/2 = 0
3/5*2*(x+4)+x+2*(-x)-3*2 = 0
11/5*x-2*x-6+24/5 = 0
1/5*x-6+24/5 = 0
1/5*x-6/5 = 0
(1/5*x-6/5)/2 = 0
(1/5*x-6/5)/2 = 0 // * 2
1/5*x-6/5 = 0
1/5*x-6/5 = 0 // + 6/5
1/5*x = 6/5 // : 1/5
x = 6/5/1/5
x = 6
x = 6
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