looking to compare my answers

Answer 1

1) multiply both sides by 10^n where n is the largest number of decimal places in the problem

2) 1/2 - 7/12b= 1/6b + 11/4

multiplies by the LCD , which is 12

6 - 7b = 2b + 33

6 = 9b + 33

-27 = 9b

b = -3

3) sometimes

2x - x = x + 1 has no solution

4) sometimes: as shown in #3, the variable is eliminated resulting

in a contradiction, so there is no solution. If it is a true statement, or identity

then ALL REAL NUMBERS are a solultion

5) so then there is a single solution x=0, so always

6) if it results in a false statement as in #3

7) if it results in a TRUE STATEMENT or IDENTITY