9x – _________ = –21 has the solution (–2)
9x – 3 = –21 has the solution (–2)
In the question it is given that, x = -2
Then, let us assume the missing number be y
(9 × (-2)) – y = -21
-18 – y = -21
y = -21 + 18
y = - 3
Y = 3
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