2/5=7/a

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Solution for 2/5=7/a equation: 


D( a )

a = 0

a = 0

a = 0

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

2/5 = 7/a // - 7/a

2/5-(7/a) = 0

2/5-7*a^-1 = 0

-7*a^-1 = -2/5 // : -7

a^-1 = 2/35

-1 < 0

1/(a^1) = 2/35 // * a^1

1 = 2/35*a^1 // : 2/35

35/2 = a^1

a = 35/2

a = 35/2

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