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g in (-oo:+oo)
(2/5)*(g-7) = 3 // - 3
(2/5)*(g-7)-3 = 0
2/5*(g-7)-3 = 0
2/5*(g-7)-3 = 0
2/5*g-29/5 = 0
2/5*g-29/5 = 0
2/5*g-29/5 = 0 // + 29/5
2/5*g = 29/5 // : 2/5
g = 29/5/2/5
g = 29/2
g = 29/2
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