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Anonymous
Substituting n for 30 gives 6 x 9 x 30 = 1620.
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6x - 9 = 21 6x = 21 + 9 6x = 28 x = 28/6 Reduce to: x = 14/3
24
6x what = 180
It is -6x - 9
If you mean 6x+9 = 63 then the value of x works out as 9