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x in (-oo:+oo)
(7/9)*x+7 = 8*x+4/9 // - 8*x+4/9
(7/9)*x-(8*x)-(4/9)+7 = 0
(7/9)*x-8*x-4/9+7 = 0
59/9-65/9*x = 0 // - 59/9
-65/9*x = -59/9 // : -65/9
x = -59/9/(-65/9)
x = 59/65
x = 59/65
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