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x in (-oo:+oo)
(4/9)*x-(1/3) = 1/7 // - 1/7
(4/9)*x-(1/3)-(1/7) = 0
(4/9)*x-1/3-1/7 = 0
4/9*x-10/21 = 0 // + 10/21
4/9*x = 10/21 // : 4/9
x = 10/21/4/9
x = 15/14
x = 15/14
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