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x in (-oo:+oo)
7/13 = 4*x+9/6 // - 4*x+9/6
7/13-(4*x)-(9/6) = 0
7/13-4*x-3/2 = 0
-4*x-25/26 = 0 // + 25/26
-4*x = 25/26 // : -4
x = 25/26/(-4)
x = -25/104
x = -25/104
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