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g in (-oo:+oo)
(3/5)*g-4 = 9 // - 9
(3/5)*g-9-4 = 0
3/5*g-13 = 0 // + 13
3/5*g = 13 // : 3/5
g = 13/3/5
g = 65/3
g = 65/3
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