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g in (-oo:+oo)
(4/5)*g-((5/8)*g) = 7 // - 7
(4/5)*g-((5/8)*g)-7 = 0
(4/5)*g+(-5/8)*g-7 = 0
7/40*g-7 = 0 // + 7
7/40*g = 7 // : 7/40
g = 7/7/40
g = 40
g = 40
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