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x in (-oo:+oo)
G = (2*x)/5 // - (2*x)/5
G-((2*x)/5) = 0
G+(-2/5)*x = 0
G-2/5*x = 0 // - G
-2/5*x = -G // : -2/5
x = -G/(-2/5)
x = 5/2*G
x = 5/2*G
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