7 x n
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7x4+8
If x is your variable, it would be 6x+7x. If x is negative, it would be 6(-x)+7(-x).
48-n=4n-7
0.87
If you write every number once, then you will write the number nine exactly once. If you mean "... the digit9, it should appear 20 times: 10 times in the ten's place, and 10 times in the one's place.