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x in (-oo:+oo)
15 = 7-(x/(-9)) // - 7-(x/(-9))
x/(-9)-7+15 = 0
8-1/9*x = 0 // - 8
-1/9*x = -8 // : -1/9
x = -8/(-1/9)
x = 72
x = 72
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