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maka =
2x - 3 = -5
2x = -5 + 3
2x = -2
x = -2 : 2 = -1
atau
2x - 3 = 5
2x = 5 + 3
2x = 8
x = 8 : 2 = 4
jadi HP = { - 1, 4 }
semoga membantu ya, tapi maaf saya bingung untuk yang b.