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g in (-oo:+oo)
(1/4)*(g-30) = 15 // - 15
(1/4)*(g-30)-15 = 0
1/4*(g-30)-15 = 0
1/4*(g-30)-15 = 0
1/4*g-45/2 = 0
1/4*g-45/2 = 0
1/4*g-45/2 = 0 // + 45/2
1/4*g = 45/2 // : 1/4
g = 45/2/1/4
g = 90
g = 90
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