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% change = |original value - new value|/original value * 100%
If this value a satisfy the equation, then a is a solution for that equation. ( or we can say that for the value a the equation is true)
Gradient= change in field value divided by the distance
"430 5" is not an equation and it does not have an unknown value. So there can be no equation which has the same unknown value.
Variables in a math problem vary or change. If in an equation, different variables change values depending on constants, evanuations, etc. For example: in y = x + 2, y can be any number as long as x is that number plus two. The varibles in this equation change value but are defined by the equation.