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x in (-oo:+oo)
(4/5)*x-5 = 4 // - 4
(4/5)*x-5-4 = 0
4/5*x-9 = 0 // + 9
4/5*x = 9 // : 4/5
x = 9/4/5
x = 45/4
x = 45/4
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