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x in (-oo:+oo)
(4*x)/5 = 9/2 // - 9/2
(4*x)/5-(9/2) = 0
(4*x)/5-9/2 = 0
4/5*x-9/2 = 0 // + 9/2
4/5*x = 9/2 // : 4/5
x = 9/2/4/5
x = 45/8
x = 45/8
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