Most equations in physics are never true. All that can be done is to find more an more evidence in support of the equation. However, it is always possible that there is an as-yet-unknown factor which changes all the equations. this is what happened to Newtonian physics as a result of Einstein's work.
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Such an equation is called an IDENTITY.
Solution
an solution
you have to solve the actual equation in order to answer this about your variable
The LHS expression = RHS expression