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g in (-oo:+oo)
9/4-((1/4)*g)-((1/2)*g) = 0
(-1/4)*g+(-1/2)*g+9/4 = 0
9/4-3/4*g = 0 // - 9/4
-3/4*g = -9/4 // : -3/4
g = -9/4/(-3/4)
g = 3
g = 3
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