Question

AUXILIO, ¿Me lo podrían desarrollar?

2.1+[-(3.5+2.1)+(5+3.5)]=5

Answer 1

2×+(-(15×+2×)+(5+15))=5
2×+(-(17×)+5+15×)=5
2×+(-17×+5+15×)=5
2×+(-2×+5)=5
2×-2×+5=5
0=0