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x in (-oo:+oo)
-x/9 = -54/78 // + -54/78
-x/9-(-54/78) = 0
9/13-x/9 = 0
9/13-1/9*x = 0 // - 9/13
-1/9*x = -9/13 // : -1/9
x = -9/13/(-1/9)
x = 81/13
x = 81/13
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