What is the answer to the math problem 17-3=16- ?

Well 17-3=14, so you want 16-? to also equal 14. subtract 14 from 16, being left with 2. 2 is your final answer

3 -  =  - 7

First, simplify  to  / Your problem should look like: 3 -  =  - 7
Second, simplify  to  / Your problem should look like: 3 -  =  - 7
Third, multiply both sides by 9 (the LCD of 9,3). / Your problem should look like: 27 - 2b = 3b - 63
Fourth, add 2b to both sides. / Your problem should look like: 27 = 3b - 63 + 2b
Fifth, simplify 3b - 63 + 2b to 5b - 63. / Your problem should look like: 27 = 5b - 63
Sixth, add 63 to both sides. / Your problem should look like: 27 + 63 = 5b
Seventh, simplify 27 + 63 to 90. / Your problem should look like: 90 = 5b
Eighth, divide both sides by 5. / Your problem should look like:  = b
Ninth, simplify  to 18. / Your problem should look like: 18 = b
Tenth, switch sides. Your problem should look like: b = 18

 b = 18