it has no more particles that can be seen
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It only has one solution.
In algebra, one solution means that there is only one real value x that will satisfy its equation.
When the solution is equal to a number, in other words, only one solution happens if you solve for your variables. 0 = 0 means there are many solutions and a number not equal to another number has no solution.
NO! A linear system can only have one solution (the lines intersect at one point), no solution (the lines are parallel), and infinitely many solutions (the lines are equivalent).
There is only one equation - possibly due to the limitations of the browser. There are not enough equations to derive a solution.