Answer:
12.9x-9
Step-by-step explanation:
First you have to combine the like terms which are 5.3x + 7.6x= 12.9x. Then you just rewrite the equation 12.9x-9. You just leave the 9 by it self beacuse thers no other like terms. 
 
        
                    
             
        
        
        
Answer: N=-4
Step-by-step explanation:
STEP
1
:
STEP
2
:
Pulling out like terms
 2.1     Pull out like factors :
   -4n - 9  =   -1 • (4n + 9) 
Equation at the end of step
2
:
  -3 • (4n + 9) -  21  = 0 
STEP
3
:
STEP
4
:
Pulling out like terms
 4.1     Pull out like factors :
   -12n - 48  =   -12 • (n + 4) 
Equation at the end of step
4
:
  -12 • (n + 4)  = 0 
STEP
5
:
Equations which are never true:
 5.1      Solve :    -12   =  0
This equation has no solution.
A a non-zero constant never equals zero.
Solving a Single Variable Equation:
 5.2      Solve  :    n+4 = 0 
 Subtract  4  from both sides of the equation : 
                      n = -4
One solution was found :
 n = -4
 
        
                    
             
        
        
        
140 1/8 can not be expressed in radical form because it neither has an exponent or a square root. Unless if 140 is raised to the power of 1/8, then that can be.
        
             
        
        
        
-5 because a negative plus a negative is a positive this is why it is the right answer