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x in (-oo:+oo)
80/3200 = x/3600 // - x/3600
80/3200-(x/3600) = 0
1/40-1/3600*x = 0 // - 1/40
-1/3600*x = -1/40 // : -1/3600
x = -1/40/(-1/3600)
x = 90
x = 90
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