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x in (-oo:+oo)
-7 = x+50/(-9) // - x+50/(-9)
-x-(50/(-9))-7 = 0
50/9-x-7 = 0
-x-13/9 = 0 // + 13/9
-x = 13/9 // * -1
x = -13/9
x = -13/9
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