2 answers:
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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