A.A+B=C+D B.A+2B=2C+D C.2A+B=2C+D 2A+B=C+2D
A.A+B=C+D B.2A+B=C+2D C.2A+B=2C+D A+2B=2C+D
A.A+B═C+D B.A+2B═2C+D C.2A+B═2C+D 2A+B═C+2D