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x in (-oo:+oo)
(5/6)*x-(2/3) = -4 // + 4
(5/6)*x-(2/3)+4 = 0
(5/6)*x-2/3+4 = 0
5/6*x+10/3 = 0 // - 10/3
5/6*x = -10/3 // : 5/6
x = -10/3/5/6
x = -4
x = -4
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