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x in (-oo:+oo)
(9/10)*x-(4/5) = 5 // - 5
(9/10)*x-(4/5)-5 = 0
(9/10)*x-4/5-5 = 0
9/10*x-29/5 = 0 // + 29/5
9/10*x = 29/5 // : 9/10
x = 29/5/9/10
x = 58/9
x = 58/9
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