How do write this expression?

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c.Three more than double x equals nine.
d. 7 more than s equals 15.
e.The square root of x is 4.
f. 31 is five less than six times x.
g. The product of 5 and x is equal to forty five.
h. 16 equals 4 less than 3 times n.
i.The total age of two sisters is 27. Determine the age of the girls if one sister is twice the age of the other.
 
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