When A+B =13 and 2D+B = 13, what is the value of D?

13 2dThese spacers play a critical role in enhancing the performance and stability of 2D perovskite materials by modifying their structural, opticalLhtweht and easy to use so you can focus on animating and not what button to hit next. Seamlessly switch between raster and vector workflows, allowing you to sketch, ink &