Verified Answer :

-7p= 49
   p= 49/-7
   p = -7

Pulling out like terms :

 1.1     Pull out like factors :

   -7p - 49  =   -7 • (p + 7) 

Equation at the end of step  1  : Step  2  :Equations which are never true :

 2.1      Solve :    -7   =  0

This equation has no solution.
 A a non-zero constant never equals zero.

Solving a Single Variable Equation :

 2.2      Solve  :    p+7 = 0 

 Subtract  7  from both sides of the equation : 
                      p = -7

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