Question

a) Solve:
2x + 9 = 5
5​

Answer 1

Answer:

$2x + 9 = 5 \\ = 2x = 5 - 9 \\ = 2x = ( - 4) \\ = x = \frac{ - 4}{2} \\ = x = ( - 2)$

Answer 2

Answer:

$2x + 9 = 55 \\ \ 2x = 55 - 9 = 46 \\ 2x = 46 \\ \\ x = 46 \div 2 = 23 \\ \\ x = 23 \\ \\ 2 \times 23 + 9 = 55 \\ \\ 46 + 9 = 55 \\ \\ 55 = 55$