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x in (-oo:+oo)
(2/5)*x-2 = (3/20)*x // - (3/20)*x
(2/5)*x-((3/20)*x)-2 = 0
(2/5)*x+(-3/20)*x-2 = 0
1/4*x-2 = 0 // + 2
1/4*x = 2 // : 1/4
x = 2/1/4
x = 8
x = 8
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