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1) 1st integer = x ; 2nd integer = x + 1
x + x + 1 = 73
2x = 73 - 1
2x = 72
2x/2 = 72/2
x = 36
1st integer = x = 36
2nd integer = x + 1 = 36 + 1 = 37

2) 1st integer = -x ; 2nd integer = -x + 1
-x + -x + 1 = -171
-2x +1 = -171
-2x = -171 - 1
-2x = -172
-2x/-2 = -172/-2
x = 86
1st interger = -86 ;
2nd integer = -86 + 1 = -85 (integer closest to zero)

3) 1st integer = x ; 2nd integer = x + 1 ; 3rd integer = x + 2
x + x+1 + x+2 = 78
3x + 3 = 78
3x = 78 - 3
3x = 75
3x/3 = 75/3
x = 25
1st integer = x = 25 (integer closest to zero)
2nd integer = x + 1 = 25 + 1 = 26
3rd integer = x + 2 = 25 + 2 = 27

4) 1st integer = x ; 2nd integer = x + 1 ; 3rd integer = x + 2
x + x+1 + x+2 = 261
3x + 3 = 261
3x = 261 - 3
3x = 258
3x/3 = 258/3
x = 86
1st integer = x = 86
2nd integer = x + 1 = 86 + 1 = 87 (middle number)
3rd integer = x + 2 = 86 + 2 = 88

5) 1st integer = -x ; 2nd integer = -x+1 ; 3rd integer = -x + 2
-x + -x+1 + -x+2 = -165
-3x + 3 = -165
-3x = -165 - 3
-3x = -168
-3x/-3 = -168/-3
x = 56
1st integer = -x = -56
2nd integer = -x+1 = -56 + 1 = -55
3rd integer = -x+2 = -56 + 2 = -54 (closest to zero)