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x in (-oo:+oo)
(1*x)/9+13 = 4 // - 4
(1*x)/9-4+13 = 0
x/9-4+13 = 0
1/9*x+9 = 0 // - 9
1/9*x = -9 // : 1/9
x = -9/1/9
x = -81
x = -81
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