There is no simple answer.
To an extent, the solution depends on the domain. 5x = 3 has no answer if x must be an integer, but it does (3/5) if x can be a fraction. Similarly, x^2 = 5 has no rational answer but there is an irrational answer; x^2 = -5 has no real answer but it has a complex answer.
There are also some functions that simply cannot be solved - the best that can be done is to find numerical approximations.
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x raised to the power 36 is x36. Without a value for x, there is nothing to solve!
X * X = 5.4 multiply X's X^2 = 5.4 take square root of each side X = 2.32379
How do you solve 4y plus x equals 8
You cannot solve 'x' in math unless the other number has a variable as well.
To solve for x, we'd have to know what this expression equals.