Question

x-3\5+x-4\7=6-2x-1\35​

Answer 1

7x-21+5x-20 5-2x

--------------------= -----------

5 35

{12x-41}35=25-10x

420x-1435=25-10x

430x=1460

x=3.395

Answer 2

Step-by-step explanation:

Pure calcium carbonate can be produced from marble, or it can be prepared by passing carbon dioxide into a solution of calcium hydroxide. In the later case calcium carbonate is derived from the mixture, forming a grade of product called "precipitated calcium carbonate,” or PCC.