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3x - 4 < 7x + 8
3x - 7x < 8 + 4
-4x < 12
4x > -12
x >
x > -3
Sorry hanya bisa jawab nomor 1
= 3x -7x < 8 + 4
= -4x < 12
= x > -3
2. bilangan yang terdapat pada kedua himpunan
3. 2 × 22/7 × 21/2 ×21/2
= 693