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g in (-oo:+oo)
7*g-((4*(g-3))/5) = g-9 // - g-9
7*g-((4*(g-3))/5)-g+9 = 0
(-4/5)*(g-3)+7*g-g+9 = 0
7*g-4/5*(g-3)-g+9 = 0
7*g-4/5*(g-3)-g+9 = 0
31/5*g-g+12/5+9 = 0
26/5*g+12/5+9 = 0
26/5*g+57/5 = 0
26/5*g+57/5 = 0
26/5*g+57/5 = 0 // - 57/5
26/5*g = -57/5 // : 26/5
g = -57/5/26/5
g = -57/26
g = -57/26
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