Write the sentence using mathematical symbols and numbers.
A number (call it $n$n) minus seven equals two.
Which of the following equations is equivalent to $y$y is $6$6 less than $x$x?
Write an equation in simplest form for:
$y$y is $19$19 times $k$k.
Which one of the following equations represents $c$c is $\frac{1}{5}$15th of $d$d?