a=(x+d)/2

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Solution for a=(x+d)/2 equation: 


x in (-oo:+oo)

a = (d+x)/2 // - (d+x)/2

a-((d+x)/2) = 0

(-1*(d+x))/2+a = 0

(-1*(d+x))/2+(2*a)/2 = 0

2*a-1*(d+x) = 0

2*a-d-x = 0

(2*a-d-x)/2 = 0

(2*a-d-x)/2 = 0 // * 2

2*a-d-x = 0

2*a-d-x = 0 // - 2*a-d

-x = -(2*a-d) // * -1

x = 2*a-d

x = 2*a-d

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