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g in (-oo:+oo)
(-2/5)*g+2 = 10 // - 10
(-2/5)*g-10+2 = 0
-2/5*g-8 = 0 // + 8
-2/5*g = 8 // : -2/5
g = 8/(-2/5)
g = -20
g = -20
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