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x in (-oo:+oo)
40/80 = x/150 // - x/150
40/80-(x/150) = 0
1/2-1/150*x = 0 // - 1/2
-1/150*x = -1/2 // : -1/150
x = -1/2/(-1/150)
x = 75
x = 75
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