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x in (-oo:+oo)
(4/9)*x-(1/5) = (2/3)*x-(2/5) // - (2/3)*x-(2/5)
(4/9)*x-((2/3)*x)-(1/5)+2/5 = 0
(4/9)*x+(-2/3)*x-1/5+2/5 = 0
1/5-2/9*x = 0 // - 1/5
-2/9*x = -1/5 // : -2/9
x = -1/5/(-2/9)
x = 9/10
x = 9/10
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