ABSTRACT
Problem 2. If a C b D w x C y, express x as the subject.
Rearranging gives:
w x C y D aC b and x D aC b w y Multiplying both sides by 1 gives:
1x D 1a C b w y i.e. x D a bC wC y The result of multiplying each side of the equation by 1 is to change all the signs in the equation.
