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x in (-oo:+oo)
(3/5)*x-((2/3)*x) = 3 // - 3
(3/5)*x-((2/3)*x)-3 = 0
(3/5)*x+(-2/3)*x-3 = 0
-1/15*x-3 = 0 // + 3
-1/15*x = 3 // : -1/15
x = 3/(-1/15)
x = -45
x = -45
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