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x in (-oo:+oo)
1 = 13*x-(56/9) // - 13*x-(56/9)
56/9-(13*x)+1 = 0
56/9-13*x+1 = 0
65/9-13*x = 0 // - 65/9
-13*x = -65/9 // : -13
x = -65/9/(-13)
x = 5/9
x = 5/9
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