x^2 + 8x + 7 = 0;
(x + 7)(x + 1) = 0;
x + 7 = 0; x = -7;
x + 1 = 0; x = -1;
The solution set is {x = -7 or x = -1}

I enjoy playing the piano.
Gerund phrase: Playing the piano;
Noun function: Direct object

When a solution is basic, the pH is always greater than 7.

A strong base is a basic chemical compound that can remove a proton (H+) from (or deprotonate) a molecule of a very weak acid in an acid-base reaction.

There is 1 mole of sugar molecules per 1 litre of solution.