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4x + 5x + 12 = -6 (given)
9x + 12 = -6 (simplify)
9x = -18 (subtraction)
x = -2 (addition)

Which reason is incorrect?
A) addition
B) given
C) simplify
D) subtraction

Respuesta :

The last step is incorrect. Addition is NOT used. Instead, division is used since both sides were divided by 9

So the answer is choice A) addition. 

Answer:

Addition

Step-by-step explanation:

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