Question

90+{24:12×[20-5×(49:7-36:6-36:6)×a]}=100 va rog frumos!

Answer 1

90+{2X(15X(7-6-6)Xa)}=100
90+2x(15x7)xa=100
90+(2x105)xa=100
90+210xa=100
300xa=100
a=300:100
a=3

Answer 2

90+{24:12*[20-5*(7-6-6)*a]}=100
90+[24:12*(20-5*1*a)]=100
90+2*(20-5a)=100
2*(20-5a)=100-90
2*(20-5a)=10
20-5a=10:2
20-5a=5
5a=20+5
5a=25
a=25:5
a=5