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x in (-oo:+oo)
-13*x-(44/(-7)) = 23 // - 23
-13*x-(44/(-7))-23 = 0
44/7-13*x-23 = 0
-13*x-117/7 = 0 // + 117/7
-13*x = 117/7 // : -13
x = 117/7/(-13)
x = -9/7
x = -9/7
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