Respuesta :
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x - 9.9 = 2.1
+ 9.9 to both sides
x = 12
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Answer:
X = 12
Step-by-step explanation:
X - 9.9 = 2.1
Add 9.9 to both sides
X - 9.9 + 9.9 = 2.1 + 9.9
Simplify
X = 12