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x in (-oo:+oo)
(2/5)*x-((5/9)*x) = 2 // - 2
(2/5)*x-((5/9)*x)-2 = 0
(2/5)*x+(-5/9)*x-2 = 0
-7/45*x-2 = 0 // + 2
-7/45*x = 2 // : -7/45
x = 2/(-7/45)
x = -90/7
x = -90/7
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