A quadratic equation always has TWO (2) solutions.
They may be different, the same, or non-existant as real numbers (ie they only exist as complex numbers).
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If the discriminant of a quadratic equation is less then 0 then it will have no real solutions.
The number of solutions an equation has depends on the nature of the equation. A linear equation typically has one solution, a quadratic equation can have two solutions, and a cubic equation can have three solutions. However, equations can also have no solution or an infinite number of solutions depending on the specific values and relationships within the equation. It is important to analyze the equation and its characteristics to determine the number of solutions accurately.
240 is not an equation and so the concept of solutions is meaningless.
A single linear equation in two variables has infinitely many solutions. Two linear equations in two variables will usually have a single solution - but it is also possible that they have no solution, or infinitely many solutions.
0 = 0 is an identity and not an equation. Equations have solutions, identities do not.