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x in (-oo:+oo)
(4/5)*x-(1/2) = 23/10 // - 23/10
(4/5)*x-(1/2)-(23/10) = 0
(4/5)*x-1/2-23/10 = 0
4/5*x-14/5 = 0 // + 14/5
4/5*x = 14/5 // : 4/5
x = 14/5/4/5
x = 7/2
x = 7/2
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