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x in (-oo:+oo)
(4/5)*x+1/3 = 5/6 // - 5/6
(4/5)*x+1/3-(5/6) = 0
(4/5)*x+1/3-5/6 = 0
4/5*x-1/2 = 0 // + 1/2
4/5*x = 1/2 // : 4/5
x = 1/2/4/5
x = 5/8
x = 5/8
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