232 + [ 48 x 25 + ( 10 x a - 82 x 5 ) x10 ] : 100 = 797
[ 1 200 + ( 10 x a - 410 ) x10 ] : 100 = 797 - 232
[ 1 200 + ( 10 x a - 410 ) x10 ] : 100 = 565
1 200 + ( 10 x a - 410 ) x10 = 565 × 100
1 200 + ( 10 x a - 410 ) x10 = 56 500
( 10 x a - 410 ) x10 = 56 500 - 1 200
( 10 x a - 410 ) x10 = 55 300
10 x a - 410 = 55 300 : 10
10 x a - 410 = 5 530
10 × a = 5 530 + 410
10 × a = 5 940
a = 5 940 : 10
a = 594
