1st number = x
2nd number = x+2
3rd number = x+4
x + x+2 +x+4 = 3x+6
3x+6 = 5(x+2)-18
3x+6 = 5x+10-18
3x+6 = 5x-8
3x+14 =5x
14 = 2x
x = 14/2 = 7
1st number = 7
2nd number = 7+2 = 9
3rd number = 7+4 = 11
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