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x in (-oo:+oo)
2-(x/10) = 1/2-x/4 // - 1/2-x/4
2-(x/10)-(-x/4)-(1/2) = 0
(1/4)*x-(x/10)-1/2+2 = 0
3/20*x+3/2 = 0 // - 3/2
3/20*x = -3/2 // : 3/20
x = -3/2/3/20
x = -10
x = -10
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