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x in (-oo:+oo)
4/16 = x/40 // - x/40
4/16-(x/40) = 0
1/4-1/40*x = 0 // - 1/4
-1/40*x = -1/4 // : -1/40
x = -1/4/(-1/40)
x = 10
x = 10
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