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x in (-oo:+oo)
(-1/3)*x+(5/6)*x+2 = (1/6)*x-1/2 // - (1/6)*x-1/2
(-1/3)*x+(5/6)*x-((1/6)*x)-(-1/2)+2 = 0
(-1/3)*x+(5/6)*x+(-1/6)*x+1/2+2 = 0
1/3*x+5/2 = 0 // - 5/2
1/3*x = -5/2 // : 1/3
x = -5/2/1/3
x = -15/2
x = -15/2
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