Question

{[(2x-3)x4-5]x6-7}x8-9=271

Answer 1

{[(2x-3)×4-5]×6-7}×8=271+9
{[(2x-3)×4-5]×6-7}×8=280
{[(2x-3)×4-5]×6-7}=280:8
[(2x-3)×4-5]×6-7=35
[(2x-3)×4-5]×6=35+7
[(2x-3)×4-5]×6=42
[(2x-3)×4-5]=42:6
(2x-3)×4-5=7
(2x-3)×4=7+5
(2x-3)×4=12
2x-3=12:4
2x-3=3
2x=3+3
2x=6
x=6:2
x=3

Answer 2

{[(2x-3)*4-5]*6-7}*8=280
[(2x-3)*4-5]*6-7=35
[(2x-3)*4-5]*6=42
(2x-3)*4-5=7
(2x-3)*4=12
2x-3=3
2x=6
x=3