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