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x in (-oo:+oo)
(2/3)*x-((4/7)*x) = 5/9 // - 5/9
(2/3)*x-((4/7)*x)-(5/9) = 0
(2/3)*x+(-4/7)*x-5/9 = 0
2/21*x-5/9 = 0 // + 5/9
2/21*x = 5/9 // : 2/21
x = 5/9/2/21
x = 35/6
x = 35/6
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