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