(a+b)x/2=s

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


x in (-oo:+oo)

(x*(a+b))/2 = s // - s

(x*(a+b))/2-s = 0

(x*(a+b))/2+(2*(-s))/2 = 0

x*(a+b)+2*(-s) = 0

a*x+b*x-2*s = 0

a*x+b*x-2*s = 0

b*x-2*s = 0 // + -2*s

b*x = -(-2*s) // : b

x = (-(-2*s))/b

x = (2*s)/b

x-2*b^-1*s = 0

(x-2*b^-1*s)/2 = 0

(x-2*b^-1*s)/2 = 0 // * 2

x-2*b^-1*s = 0

x-2*b^-1*s = 0 // + -2*b^-1*s

x = -(-2*b^-1*s)

x = 2*b^-1*s

x = 2*b^-1*s

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