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x in (-oo:+oo)
x-(1/2)-1 = (1/3)*(x-7) // - (1/3)*(x-7)
x-((1/3)*(x-7))-(1/2)-1 = 0
(-1/3)*(x-7)+x-1/2-1 = 0
x-1/3*(x-7)-1/2-1 = 0
(-1/3*2*(x-7))/2+(2*x)/2-1/2+(-1*2)/2 = 0
2*x-1/3*2*(x-7)-1*2-1 = 0
4/3*x-2-1+14/3 = 0
4/3*x-2+11/3 = 0
4/3*x+5/3 = 0
(4/3*x+5/3)/2 = 0
(4/3*x+5/3)/2 = 0 // * 2
4/3*x+5/3 = 0
4/3*x+5/3 = 0 // - 5/3
4/3*x = -5/3 // : 4/3
x = -5/3/4/3
x = -5/4
x = -5/4
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