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3x + 21 = 10x -12
3x-10x = -12 -21
- 7x = -33
x = -33/-7
x = 33/7
1/2x + 7/2 = 5/3x - 6/3
kali 6 (KPK 2&3)
3x + 21 = 10x - 12
3x - 10x = -12 -21
-7x = -33
x = -33/-7
x = 33/7
x = 4 5/7