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x in (-oo:+oo)
(7*x)/8-((2*x)/9) = 1 // - 1
(7*x)/8-((2*x)/9)-1 = 0
(7*x)/8+(-2/9)*x-1 = 0
47/72*x-1 = 0 // + 1
47/72*x = 1 // : 47/72
x = 1/47/72
x = 72/47
x = 72/47
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