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x in (-oo:+oo)
(1/7)*x = 5.5 // - 5.5
(1/7)*x-5.5 = 0
1/7*x-5.5 = 0 // + 5.5
1/7*x = 5.5 // : 1/7
x = 5.5/1/7
x = 38.50000077
x = 38.50000077
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