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3 - x < 2x + 15
-x - 2x < 15 - 3
-3x < 12
x > -12/3 (tanda pertidaksamaan berubah/dibalik karena semua ruas dikalikan negatif)
x > -4
2. diagonal 3x - 8 atau 2x + 10,
3x - 8 = 2x + 10
3x - 2x = 10 + 8
x = 18
^^ jawaban terbaik yaa..
10-8
x=-1x. (di bagi)
2
x=-1. jadi hasilnya -1
Mf kalau salah.