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x in (-oo:+oo)
(3/5)*x = (5/4)*x-13 // - (5/4)*x-13
(3/5)*x-((5/4)*x)+13 = 0
(3/5)*x+(-5/4)*x+13 = 0
13-13/20*x = 0 // - 13
-13/20*x = -13 // : -13/20
x = -13/(-13/20)
x = 20
x = 20
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