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x in (-oo:+oo)
2/10 = x/(-20) // - x/(-20)
2/10-(x/(-20)) = 0
1/20*x+1/5 = 0 // - 1/5
1/20*x = -1/5 // : 1/20
x = -1/5/1/20
x = -4
x = -4
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