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g in (-oo:+oo)
(2/8)*g = 2/7 // - 2/7
(2/8)*g-(2/7) = 0
(2/8)*g-2/7 = 0
1/4*g-2/7 = 0 // + 2/7
1/4*g = 2/7 // : 1/4
g = 2/7/1/4
g = 8/7
g = 8/7
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