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x in (-oo:+oo)
-x/9 = 7/2 // - 7/2
-x/9-(7/2) = 0
-x/9-7/2 = 0
-1/9*x-7/2 = 0 // + 7/2
-1/9*x = 7/2 // : -1/9
x = 7/2/(-1/9)
x = -63/2
x = -63/2
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