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x in (-oo:+oo)
75/50 = x/10 // - x/10
75/50-(x/10) = 0
3/2-1/10*x = 0 // - 3/2
-1/10*x = -3/2 // : -1/10
x = -3/2/(-1/10)
x = 15
x = 15
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