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x in (-oo:+oo)
75/20 = x/19 // - x/19
75/20-(x/19) = 0
15/4-1/19*x = 0 // - 15/4
-1/19*x = -15/4 // : -1/19
x = -15/4/(-1/19)
x = 285/4
x = 285/4
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