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x in (-oo:+oo)
7 = x/0.9 // - x/0.9
7-(x/0.9) = 0
7-1.11111111*x = 0
7-1.11111111*x = 0 // - 7
-1.11111111*x = -7 // : -1.11111111
x = -7/(-1.11111111)
x = 6.30000001
x = 6.30000001
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