SOLUTION: SOLVE: 5a-5=7a-19 I've tried solving it several times and they have the answer in the back of the book but I would like to know how they got that answer. Thank You.

Algebra ->  Expressions-with-variables -> SOLUTION: SOLVE: 5a-5=7a-19 I've tried solving it several times and they have the answer in the back of the book but I would like to know how they got that answer. Thank You.      Log On


   

Question 224106: SOLVE:
5a-5=7a-19
I've tried solving it several times and they have the answer in the back of the book but I would like to know how they got that answer.
Thank You.
Answer by rapaljer(4671) About Me  (Show Source):
You can put this solution on YOUR website!
5a-5=7a-19

Subtract 7a from each side:
5a-7a -5= 7a -7a-19

-2a-5= -19

Add + 5 to each side:
-2a-5+5=-19+5
-2z=-14

Divide both sides by -2:
%28-2z%29%2F-2=%28-14%29%2F-2
x=7


For an additional explanation of Equation solving, see my own website by doing a "Bing" search for my last name "Rapalje". Look for my website "Rapalje Homepage" near the top of the search list. On my webpage, look for "Basic, Intermediate and College Algebra: One Step at a Time." Select "Basic Algebra" and look in "Chapter 1" for "1.08 Basic Equation Solving." This is my own non-traditional explanation that my own students ALL found easier to understand than the one given in traditional textbooks. See also the corresponding section in my "MATH IN LIVING COLOR" pages in which I solved a lot of these types of problems in COLOR!!

R^2

Dr. Robert J. Rapalje, Retired
Seminole State College of Florida
Altamonte Springs Campus