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(I'm not sure if this is the best way.)
b is a list of solutions, and you want the right hand side of the first solution.
var('x,y')
a = y - 2 == x
b = solve(a, y)
c=b[0].rhs()
print c
print type(c)
print c(x=5)
Output:
x + 2
<type 'sage.symbolic.expression.Expression'>
7
