I understand why you ask...but the answer is no.
As a mathematical object, zero is an integer -- a number. As such, zero could easily be a SOLUTION to an EQUATION. But it's not the same as an equation. An equation is a different kind of mathematical object entirely.
It's probably a good idea to try looking at zero not as "nothing", but as something: the middle point between positive and negative numbers.
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r=0 is the solution...
An equation that is simplified to 0 0 is called a perfect equation. It usually have exactly one solution.
The equation 3m - 3m - 7 = 0, simplifies to -7 = 0 this means that the the solution is no solution, since -7 doesn't equal 0.
Only a linear equation in one variable x , which is an equation of the form ax + b = 0, (where a is different than 0), has only one solution. The solution is: x = -b/a
If the two equations are linear transformations of one another they have the same solution.