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2x = 7 + 5
2x = 12
x = 6
Didapat syarat
x+x-5 = 7
2x-5 = 7
2x = 12
x = 6
Untuk
Didapat syarat
x-(x-5)=7
5 = 7 (Tidak memenuhi)
Untuk
tidak memenuhi
Untuk
Didapat syarat x < 0
-x - (x-5) = 7
-x + 5 -x = 7
-2x + 5 = 7
-2x = 2
x = -1
HP = {-1,6}