3/5=a/(a+7.5)

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Solution for 3/5=a/(a+7.5) equation: 


D( a )

a+7.5 = 0

a+7.5 = 0

a+7.5 = 0

a+7.5 = 0 // - 7.5

a = -7.5

a in (-oo:-7.5) U (-7.5:+oo)

3/5 = a/(a+7.5) // - a/(a+7.5)

3/5-(a/(a+7.5)) = 0

(-1*a)/(a+7.5)+3/5 = 0

(-1*5*a)/(5*(a+7.5))+(3*(a+7.5))/(5*(a+7.5)) = 0

3*(a+7.5)-1*5*a = 0

22.5-2*a = 0

(22.5-2*a)/(5*(a+7.5)) = 0

(22.5-2*a)/(5*(a+7.5)) = 0 // * 5*(a+7.5)

22.5-2*a = 0

22.5-2*a = 0 // - 22.5

-2*a = -22.5 // : -2

a = -22.5/(-2)

a = 11.25

a = 11.25

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