Which function is used to remove unwanted characters

((67)³² × (67)^-18 / ? = (67)⁸

What will come in the place of question mark (?) in the given expression?

?% of (112 X 3 + 164) + 75 = 2 X 140 + 35

20% of 450 - 15% of 400 = 25% of ?

√121 + √961− √289 =?²

45% of 1020 + ?% of 960 = 747

(〖(0.4)〗^(1/3)  × 〖(1/64)〗^(1/4)  × 〖16〗^(1/6)  × 〖(0.256)〗^(2/3))/(〖(0.16)〗^(2/3)  × 4^(-1/2)  ×〖1024〗^(-1/4) ) = ?

(512) ^(2/3) × √64 ÷ (512) ^(1/3) = (64) ^(?/2) ÷ (2)⁶ 

1231 + 1312 + 2113 – 3211 = ?

Simplify the following expression:-