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x in (-oo:+oo)
x+8/6 = (2/3)*x // - (2/3)*x
x-((2/3)*x)+8/6 = 0
x+(-2/3)*x+8/6 = 0
1/3*x+4/3 = 0 // - 4/3
1/3*x = -4/3 // : 1/3
x = -4/3/1/3
x = -4
x = -4
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