Question

5+ 3 × {6-2+[2-8: (4 +2×a)]}:6 = 7

Answer 1

5+ 3 × {6-2+[2-8: (4 +2×a)]}:6 = 7|-5
3 × {4+[2-8: (4 +2×a)]}:6 = 2| ×6
3 × {4+[2-8: (4 +2×a)]}= 12|:3
4+[2-8: (4 +2×a)]= 4|-4
2-8: (4 +2×a)= 0|+2
8:(4 +2×a)= 2|× 8
4 +2×a= 16|-4
2×a= 12|:2
a=6

Answer 2

3 x {4+[2-8:(4+2 x a)]}:6= 7+5=12
{4+[2-8:(4+2 x a)]}:6= 12:3=4
4+[2-8:(4+2 x a)]= 4 x 6= 24
2-8:(4+2 x a)= 24-4=20
-8:(4+2 x a)= 20-2=18
4+2 x a= 18 x 8=144
2 x a= 144-4=100
a= 100:2
a=50 
Sper ca nu m-am incurcat la calcule