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