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x in (-oo:+oo)
10/40 = x/20 // - x/20
10/40-(x/20) = 0
1/4-1/20*x = 0 // - 1/4
-1/20*x = -1/4 // : -1/20
x = -1/4/(-1/20)
x = 5
x = 5
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