(x-7)/(7-x) if you factor out -1 from the numerator you get:
-(7-x)/(7-x) which is equal to:
-1
Let
A-----> 
B-----> 
C-----> 
we know that
Point A-------> Multiply numerator and denominator by 

Point B-------> Multiply numerator and denominator by 

Point C-------> Multiply numerator and denominator by 

Find the distance Point A to Point C

Find the distance Point B to Point C

therefore

Point B is closer to Point C
is closer to 
the answer is
is closer to 
X=2
its x=2 because you have to divide -20x by -40 so the two negatives cancel out each other and then you get 2.
Answer:
The chosen topic is not meant for use with this type of problem. Try the examples below.
√x+2=3
−4+y=3y+4(y−3)
2+|3x|=2+3