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x in (-oo:+oo)
5/7 = (2/9)*x // - (2/9)*x
5/7-((2/9)*x) = 0
(-2/9)*x+5/7 = 0
5/7-2/9*x = 0 // - 5/7
-2/9*x = -5/7 // : -2/9
x = -5/7/(-2/9)
x = 45/14
x = 45/14
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