If x is your variable, it would be 6x+7x. If x is negative, it would be 6(-x)+7(-x).
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7 x n
48-n=4n-7
7x4+8
In order to write seven and two tenths, a person should simply use the period between the two numbers as the "and." To write the number in numerical form, the number would appear as 7.2.
6*(13 + n)