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x in (-oo:+oo)
-2/5 = 4-((2*x)/5) // - 4-((2*x)/5)
(2*x)/5-2/5-4 = 0
2/5*x-22/5 = 0 // + 22/5
2/5*x = 22/5 // : 2/5
x = 22/5/2/5
x = 11
x = 11
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