Answer:
Step-by-step explanation:

How to get answer by Mimiwhatsup (In Decimal Form):

Answer in Fraction Form: 
X= -15
First, we want to combine like terms.
4x-10=20+6x
Subtract 4x from both sides
-10=20+2x
Subtract 20 from both sides
-30=2x
Divide by 2 to isolate the variable
X= -15
Answer:
I believe it is b 10 feet bbbbbbb