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g in (-oo:+oo)
(-13*g)/4 = 9 // - 9
(-13*g)/4-9 = 0
-13/4*g-9 = 0 // + 9
-13/4*g = 9 // : -13/4
g = 9/(-13/4)
g = -36/13
g = -36/13
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