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x in (-oo:+oo)
2*x = (x-a)/b // - (x-a)/b
2*x-((x-a)/b) = 0
(-1*(x-a))/b+2*x = 0
(-1*(x-a))/b+(2*b*x)/b = 0
2*b*x-1*(x-a) = 0
a+2*b*x-x = 0
a+2*b*x-x = 0
a+2*b*x = 0 // - a
2*b*x = -a // : 2*b
x = -a/(2*b)
x = (-1/2)*a*b^-1
1/2*a*b^-1+x = 0
(1/2*a*b^-1+x)/b = 0
(1/2*a*b^-1+x)/b = 0 // * b
1/2*a*b^-1+x = 0
1/2*a*b^-1+x = 0 // - 1/2*a*b^-1
x = -(1/2*a*b^-1)
x = -1/2*a*b^-1
x = -1/2*a*b^-1
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