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g in (-oo:+oo)
(9*(5*g+2))/4 = 72 // - 72
(9*(5*g+2))/4-72 = 0
(9*(5*g+2))/4+(-72*4)/4 = 0
9*(5*g+2)-72*4 = 0
45*g-270 = 0
(45*g-270)/4 = 0
(45*g-270)/4 = 0 // * 4
45*g-270 = 0
45*g-270 = 0 // + 270
45*g = 270 // : 45
g = 270/45
g = 6
g = 6
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