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3x +21 -8 < 2x -10
3x +13 < 2x -10
3x -2x < -10 -13
x < -13
Jadi, jawabannya adalah x < -13 (d.).
Maaf klo slh.
3x+21-8 < 2x-10
3x-2x < -10-21+8
x < -23