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bo
3x-4=11
3x=15/3
x=5
3x-4=2x+1
x=5
3x-4=21-2x
5x=25/5
x=5
11 bo:
3x-4=11/+4
3x=15/:3
x=5
2x+1 bo:
3x-4=2x+1/-2x
x-4=1/+4
x=5
21-2x bo:
3x-4=21-2x/+2x
5x-4=21/+4
5x=25/:5
x=5