How to solve for X: X-B=A

Step-by-step explanation:

(x-a) (x-b) = x2 - (a+b) x+ab

Now, this with the third bracket.

(x2 - (a+b) x+ab) (x-c) = x3 - (a+b+c) x2 + (ac+bc+ab) x-abc

But there's another way to do this, which is easier. Assume the given expression is equal to 0, then, we can form a cubic equation as

x3 - (sum-of-roots) x2 + (product-of-roots-taken-two-at-a-time) x - (product-of-roots), which is essentially what we got above.

To solve for X, add B to both sides to get X alone

your new equation would be:

X = A + B