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x in (-oo:+oo)
(2*x)/9 = 7/4 // - 7/4
(2*x)/9-(7/4) = 0
(2*x)/9-7/4 = 0
2/9*x-7/4 = 0 // + 7/4
2/9*x = 7/4 // : 2/9
x = 7/4/2/9
x = 63/8
x = 63/8
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