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g in (-oo:+oo)
(1/4)*(g-30) = 30 // - 30
(1/4)*(g-30)-30 = 0
1/4*(g-30)-30 = 0
1/4*(g-30)-30 = 0
1/4*g-75/2 = 0
1/4*g-75/2 = 0
1/4*g-75/2 = 0 // + 75/2
1/4*g = 75/2 // : 1/4
g = 75/2/1/4
g = 150
g = 150
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