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2(-3) - a + 3 = 0
-a = -3 + 6
-a = 3
a = -3
yang b cari sendiri aja ya
subtitusi x = -3 dan y =a
2(-3) -(a) + 3 = 0
-6 - a + 3 = 0
-a -3 =0
a = -3
trus soal yang hubungannya dengan b mana ya