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x in (-oo:+oo)
(3/5)*x = 9/4 // - 9/4
(3/5)*x-(9/4) = 0
(3/5)*x-9/4 = 0
3/5*x-9/4 = 0 // + 9/4
3/5*x = 9/4 // : 3/5
x = 9/4/3/5
x = 15/4
x = 15/4
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