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x in (-oo:+oo)
150/(40^2) = x/(50^2) // - x/(50^2)
150/(40^2)-(x/(50^2)) = 0
3/32-1/2500*x = 0 // - 3/32
-1/2500*x = -3/32 // : -1/2500
x = -3/32/(-1/2500)
x = 1875/8
x = 1875/8
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