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x in (-oo:+oo)
(1/5)*x-4 = 2-((2/5)*x) // - 2-((2/5)*x)
(1/5)*x+(2/5)*x-4-2 = 0
3/5*x-6 = 0 // + 6
3/5*x = 6 // : 3/5
x = 6/3/5
x = 10
x = 10
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