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