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Verified answer
(3x+1)-(2x-4)=123x+1-2x+4=12
3x-2x+1+4=12
x+5=12
x=12-5
x=7
3x + 1 - 2x + 4 = 12
x + 5 = 12
x = 12 - 5
x = 7
HP = {7}