Question

830-[(6×4+6×6):a]+322=1146

Answer 1

$830 - [(6 \times 4 + 6 \times 6) \div a] + 322 = 1146$

$830 - (24 + 36) \div a = 1146 - 322$

$830 - 60 \div a = 824$

$- 60 \div a = 824 - 830$

$- 60 \div a = - 6 \: | \times ( - 1)$

$60 \div a = 6$

$a = 60 \div 6$

$a = 10$