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x in (-oo:+oo)
6-(2*x) = 5*x-(1/3) // - 5*x-(1/3)
1/3-(2*x)-(5*x)+6 = 0
1/3-2*x-5*x+6 = 0
19/3-7*x = 0 // - 19/3
-7*x = -19/3 // : -7
x = -19/3/(-7)
x = 19/21
x = 19/21
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