16х+9(21-х)=11*21 помогите)

Question

16х+9(21-х)=11*21 помогите)

Answer 1

16х+9(21-х)=11*21

16x+189-9x=231

7x+189=231

7x=231-189

7x=42

x=6

 

Answer 2

16х+9(21-х)=11*21

16x+9*21-9x =231

7x = 231-189

7x =42

x = 42/7 =6