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
3×{6-2×[2-8:(4+2×a)]}:6=7-5=2
3×{6-2×[2-8:(4+2×a)]}=2x6=12
6-2×[2-8:(4+2×a)]=12/3=4
4×[2-8:(4+2×a)]=4
2-8:(4+2×a)=4/4=1
-6:(4+2×a)=1
4+2×a= 1 x (-6)
4+2×a=-6
2a=-6-4
2a=-10
a=-5