Number 11. It's solving equations containing parentheses and having the variable in both sides.
Answer (2)
11. 2 ( 6 d + 3 ) = 18 − 3 ( 16 − 3 d ) 12 d + 6 = 18 − 48 + 9 d 12 d − 9 d = 18 − 48 − 6 3 d = − 36 d = − 12
To solve equations with parentheses and variables on both sides, distribute to eliminate parentheses, combine like terms, isolate the variable, and solve. Always check your solution by substituting it back into the original equation. The example provided shows that the solution for d is − 12 .
;
