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x in (-oo:+oo)
15/20 = x/30 // - x/30
15/20-(x/30) = 0
3/4-1/30*x = 0 // - 3/4
-1/30*x = -3/4 // : -1/30
x = -3/4/(-1/30)
x = 45/2
x = 45/2
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