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f in (-oo:+oo)
(1/7)*f-(11/2) = 9/4 // - 9/4
(1/7)*f-(11/2)-(9/4) = 0
(1/7)*f-11/2-9/4 = 0
1/7*f-31/4 = 0 // + 31/4
1/7*f = 31/4 // : 1/7
f = 31/4/1/7
f = 217/4
f = 217/4
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