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x in (-oo:+oo)
(3/5)*x-(5/2) = -1 // + 1
(3/5)*x-(5/2)+1 = 0
(3/5)*x-5/2+1 = 0
3/5*x-3/2 = 0 // + 3/2
3/5*x = 3/2 // : 3/5
x = 3/2/3/5
x = 5/2
x = 5/2
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