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