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g in (-oo:+oo)
15*(20*g-5) = 25*(15/10)*g // - 25*(15/10)*g
15*(20*g-5)-(25*(15/10)*g) = 0
15*(20*g-5)+(-75/2)*g = 0
15*(20*g-5)+(-75*g)/2 = 0
(2*15*(20*g-5))/2+(-75*g)/2 = 0
2*15*(20*g-5)-75*g = 0
525*g-150 = 0
(525*g-150)/2 = 0
(525*g-150)/2 = 0 // * 2
525*g-150 = 0
525*g-150 = 0 // + 150
525*g = 150 // : 525
g = 150/525
g = 2/7
g = 2/7
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