Respuesta :

x
1−7x−21x
1 Collect like terms.
1
+
(

7
x

2
1
x
)
1+(−7x−21x)

2 Simplify.
1

2
8
x
1−28x

Answer:

3y+1 -7x(1+3y)

(1-7x)(3y+1)

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