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x in (-oo:+oo)
(2/5)*x-((3/10)*x) = 2 // - 2
(2/5)*x-((3/10)*x)-2 = 0
(2/5)*x+(-3/10)*x-2 = 0
1/10*x-2 = 0 // + 2
1/10*x = 2 // : 1/10
x = 2/1/10
x = 20
x = 20
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