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x in (-oo:+oo)
(7/9)*x = 7/10 // - 7/10
(7/9)*x-(7/10) = 0
(7/9)*x-7/10 = 0
7/9*x-7/10 = 0 // + 7/10
7/9*x = 7/10 // : 7/9
x = 7/10/7/9
x = 9/10
x = 9/10
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