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x in (-oo:+oo)
x/5+2*x = 1/2 // - 1/2
x/5+2*x-(1/2) = 0
x/5+2*x-1/2 = 0
11/5*x-1/2 = 0 // + 1/2
11/5*x = 1/2 // : 11/5
x = 1/2/11/5
x = 5/22
x = 5/22
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