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x in (-oo:+oo)
7/20 = x/20 // - x/20
7/20-(x/20) = 0
7/20-1/20*x = 0 // - 7/20
-1/20*x = -7/20 // : -1/20
x = -7/20/(-1/20)
x = 7
x = 7
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