[42 + (5 - 3) × 2] : (9 – 7) × 2

[42 + 2 × 2] : 2 × 2

[42 + 4] : 2 × 2

46 : 2 × 2

23 × 2

46

Resposta:

Olá...

[42 + (5-3) × 2]: (9-7) × 2

[42 + 2 × 2]: 2 × 2

[42 + 4]: 2 × 2

46:2 × 2

23 x 2

46

Espero ter ajudado!!Bons estudos ☺ ☺