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x in (-oo:+oo)
5*(x-3)+(-1/2)*x = x-1 // - x-1
5*(x-3)+(-1/2)*x-x+1 = 0
5*(x-3)-x/2-x+1 = 0
(2*5*(x-3))/2-x/2+(2*(-x))/2+(1*2)/2 = 0
2*5*(x-3)-x+2*(-x)+1*2 = 0
9*x-2*x-30+2 = 0
7*x-30+2 = 0
7*x-28 = 0
(7*x-28)/2 = 0
(7*x-28)/2 = 0 // * 2
7*x-28 = 0
7*x-28 = 0 // + 28
7*x = 28 // : 7
x = 28/7
x = 4
x = 4
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