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x in (-oo:+oo)
(2/9)*x-(1/6) = 1/7 // - 1/7
(2/9)*x-(1/6)-(1/7) = 0
(2/9)*x-1/6-1/7 = 0
2/9*x-13/42 = 0 // + 13/42
2/9*x = 13/42 // : 2/9
x = 13/42/2/9
x = 39/28
x = 39/28
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