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g in (-oo:+oo)
(5.4/2)*g = 9 // - 9
(5.4/2)*g-9 = 0
2.7*g-9 = 0 // + 9
2.7*g = 9 // : 2.7
g = 9/2.7
g = 3.33333333
g = 3.33333333
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