13. Given: a-b=c-d, b = -1,c= 6; Prove: a = 5 Statements
Reasons
1.) a-b = C-d
1.)
2.)
2.) b = d - 1
3.) a-(- 1) = cod
3.)
4.) a-d + 1 = C-d
5.) a + 1 = c
5.)
6.) c = 6
6.)
7.) a +1 = 6
7.)
8.) a = 5
8.)

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