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x in (-oo:+oo)
(2/5)*x-((1/(-3))*x) = 4 // - 4
(2/5)*x-((1/(-3))*x)-4 = 0
(2/5)*x+(1/3)*x-4 = 0
11/15*x-4 = 0 // + 4
11/15*x = 4 // : 11/15
x = 4/11/15
x = 60/11
x = 60/11
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