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x in (-oo:+oo)
(3*x)/7-((2*x)/9) = 1 // - 1
(3*x)/7-((2*x)/9)-1 = 0
(3*x)/7+(-2/9)*x-1 = 0
13/63*x-1 = 0 // + 1
13/63*x = 1 // : 13/63
x = 1/13/63
x = 63/13
x = 63/13
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