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g in (-oo:+oo)
(1/2)*(3*g-20) = g/2 // - g/2
(1/2)*(3*g-20)-(g/2) = 0
1/2*(3*g-20)-g/2 = 0
(1/2*2*(3*g-20))/2-g/2 = 0
1/2*2*(3*g-20)-g = 0
2*g-20 = 0
(2*g-20)/2 = 0
(2*g-20)/2 = 0 // * 2
2*g-20 = 0
2*g-20 = 0 // + 20
2*g = 20 // : 2
g = 20/2
g = 10
g = 10
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