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x in (-oo:+oo)
(2/3)*x-7 = (7/9)*x // - (7/9)*x
(2/3)*x-((7/9)*x)-7 = 0
(2/3)*x+(-7/9)*x-7 = 0
-1/9*x-7 = 0 // + 7
-1/9*x = 7 // : -1/9
x = 7/(-1/9)
x = -63
x = -63
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