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4x - 3 = 2x + 9
4x - 2x -3 + 3 = 2x - 2x + 9 + 3
2x = 12
x = 6
nomor b
3x = x + 6
3x - x = x - x + 6
2x = 6
x = 3
4x-2x=9+3
2x=12
x=12/2
x=6
3x=x+6
3x-x=6
2x=6
x=6/2
x=3
smoga bermanfaat :)