Question

x - 4 × 2 + 7 × 3- 21 = 7 × 3 - 40

Answer 1

$x - 4 \times 2 + 7 \times 3 - 21 = 7 \times 3 - 40 \\ x = 7 \times 3 - 40 + 4 \div 2 - 7 \div 3 + 21 \\ x = 21 - 40 + 2 - 2.33 + 21 \\ x = 21 - 38 - 19.33 \\ x = 21 - 57.33 \\ x = - 36.33 \: is \: answer$