The word
difference
represent the addition operation and its symbol is
.
The word
less than or equal
represent the symbol is
.
The word
the difference of n and 15 is less than or equal to 37
represents the inequality is
.
The inequality is
and solve for n.
Add 15 to each side.
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The solution of the inequality is
and its graph is

The closed circle means that 52 is a solution of the inequality.
The solution of the inequality
is
and its graph is