Question

{[(2+d)×2+2]×2+2}=100÷2+2×2

Answer 1

[(2+d)x2+2]x2+2=100:2+2x2
[(2+d)x2+2]x2+2=50+4
[(2+d)x2+2]x2+2=54
[(2+d)x2+2]x2=54-2
[(2+d)x2+2]x2=52
(2+d)x2+2=52:2
(2+d)x2+2=26
(2+d)x2=26-2
(2+d)x2=24
2+d=24:2
2+d=12
d=12-2
d=10