10. Factorizar : ax–bx + cx + ay–by + cy–a + b–c?

Ax - bx + cx + ay - by + ct - a + b - c = x(a - b + c) + y(a - b + c) - 1(a - b + c) sacando factor comun X, Y, y - 1 = (x + y - 1)(a - b + c) sacamos factor comun (a - b + c) y listo.