3x+21=39
3x=39-21
3x=18
x=6
3x+21=39;
3x=39-21;
3x=18;
x=18:3;
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3x+21=39
3x=39-21
3x=18
x=6
3x+21=39;
3x=39-21;
3x=18;
x=18:3;
x=6