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x in (-oo:+oo)
(1/3)*x-x-4/9 = -64/63 // + -64/63
(1/3)*x-x-4/9-(-64/63) = 0
(1/3)*x-x-4/9+64/63 = 0
4/7-2/3*x = 0 // - 4/7
-2/3*x = -4/7 // : -2/3
x = -4/7/(-2/3)
x = 6/7
x = 6/7
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