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x in (-oo:+oo)
(3/5)/30 = x/40 // - x/40
(3/5)/30-(x/40) = 0
1/50-1/40*x = 0 // - 1/50
-1/40*x = -1/50 // : -1/40
x = -1/50/(-1/40)
x = 4/5
x = 4/5
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