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x in (-oo:+oo)
(2/5)*x-((5/3)*x) = 4 // - 4
(2/5)*x-((5/3)*x)-4 = 0
(2/5)*x+(-5/3)*x-4 = 0
-19/15*x-4 = 0 // + 4
-19/15*x = 4 // : -19/15
x = 4/(-19/15)
x = -60/19
x = -60/19
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