Answer :

13x - 21x - 7 = 63
- 8x = 70
x = - 8.75
13x+7(-3x-1)= 63

Distribute.

13x-21x-7=63

Combine like terms.

-8x-7=63

Add 7 to both sides.

-8x=70

Divide by -8.

x= -8.75

I hope this helps!
~kaikers

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