Question

9x – ______ = –21 has the solution (–2)

Answer 1

9x – 3 = –21 has the solution (–2)

Explanation:

Let missing number be p.

9x – p = –21

${\displaystyle \Rightarrow }$ 9(–2) – p = –21

${\displaystyle \Rightarrow }$ –18 – p = –21

${\displaystyle \Rightarrow }$ –p = –21 + 18

${\displaystyle \Rightarrow }$ –p = –3

${\displaystyle \Rightarrow }$ p = 3