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x in (-oo:+oo)
x-((1/2)*x)+1/3 = -13/6 // + -13/6
x-((1/2)*x)+1/3-(-13/6) = 0
(-1/2)*x+x+1/3+13/6 = 0
1/2*x+5/2 = 0 // - 5/2
1/2*x = -5/2 // : 1/2
x = -5/2/1/2
x = -5
x = -5
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