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x in (-oo:+oo)
(2/5)*x-((5/9)*x) = 4 // - 4
(2/5)*x-((5/9)*x)-4 = 0
(2/5)*x+(-5/9)*x-4 = 0
-7/45*x-4 = 0 // + 4
-7/45*x = 4 // : -7/45
x = 4/(-7/45)
x = -180/7
x = -180/7
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