800/a=640/400

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Solution for 800/a=640/400 equation: 


D( a )

a = 0

a = 0

a = 0

a in (-oo:0) U (0:+oo)

800/a = 640/400 // - 640/400

800/a-(640/400) = 0

800/a-8/5 = 0

800*a^-1 = 8/5 // : 800

a^-1 = 1/500

-1 < 0

1/(a^1) = 1/500 // * a^1

1 = 1/500*a^1 // : 1/500

500 = a^1

a = 500

a = 500

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