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x in (-oo:+oo)
(2/7)*x-4 = 5 // - 5
(2/7)*x-5-4 = 0
2/7*x-9 = 0 // + 9
2/7*x = 9 // : 2/7
x = 9/2/7
x = 63/2
x = 63/2
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