a = b
'a' is equal to 'b'
ab = b^2
multiply each side by 'b'
ab-a^2 = b^2-a^2
subtract each side by 'a^2'
a(b-a) = b^2-a^2
factor the left side
a(b-a) = (b-a)(b+a)
factor the right side
a = b+a
divide each side by '(b-a)'
a = a+a
substitute 'b' for 'a'
a = 2a
simplify
1 = 2
divide each side by 'a'
mind = blown?
