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x in (-oo:+oo)
x/5-(1/2) = 3/10-(2*x) // - 3/10-(2*x)
x/5+2*x-(1/2)-(3/10) = 0
x/5+2*x-1/2-3/10 = 0
11/5*x-4/5 = 0 // + 4/5
11/5*x = 4/5 // : 11/5
x = 4/5/11/5
x = 4/11
x = 4/11
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