Question

[(9×?-21):3+75]:7=358-74×4​

Answer 1

[( 9 × a - 21 ) : 3 + 75] :7 = 358 - 74 × 4

[( 9 × a - 21 ) : 3 + 75] : 7 = 358 - 296

[( 9 × a - 21 ) : 3 + 75] : 7 = 62 / ×7

[( 9 × a - 21 ) : 3 + 75] = 434

( 9 × a - 21 ) : 3 = 434 - 75

( 9 × a - 21 ) : 3 = 359

( 9 × a - 21 ) = 359 × 3

( 9 × a - 21 ) = 1.077

9 × a = 1077 + 21

9 × a = 1.098

a = 1098 : 9

a = 122