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x in (-oo:+oo)
45/100 = x/60 // - x/60
45/100-(x/60) = 0
9/20-1/60*x = 0 // - 9/20
-1/60*x = -9/20 // : -1/60
x = -9/20/(-1/60)
x = 27
x = 27
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