Một con sông chảy qua 2 vùng là đất đá loại sét và đất đá kết tinh sẽ cho hình dạng lòng sông khác nhau như thế nào ? Giải thích vì sao

Amath expression is a collection of one or more terms, which are separated by the signs ( + , - , x , / ).example :   8+b8+b  or  a−3a−3in algebra, an equation is a mathematical statement with two expressions where, each expression is separated by an equal (=) sign. variables can be present on both the sides of the equality (=) sign and we use letters to denote such variables.example 1:   x=4+2x=4+2  , [here, we can observe that the variable is present only on one side of the equation].example 2:   2x+3=x+42x+3=x+4  , [here, we can observe that the variables are present on both side of the equation].

343^x = 49^4-xx = 4-xx+x=42x = 4x = 4/2x = 2therefore x = 2

I'm hella smart but i dont know that

Ithink the answer is either a , c or d