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x in (-oo:+oo)
(4*x)/2 = 9/7 // - 9/7
(4*x)/2-(9/7) = 0
(4*x)/2-9/7 = 0
2*x-9/7 = 0 // + 9/7
2*x = 9/7 // : 2
x = 9/7/2
x = 9/14
x = 9/14
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