Question 863313
Here is a great opportunity for a lesson in Mathematics and precision.
X and x are not the same in algebra.
There is no x in the given equation therefore is no solution.
 
I and i are not the same in English. 
 
Besides that your presentation of the equation is not clear.
487 / 6 * X +12-7=1628.3 could mean several things
(487 / 6) *( X +12)-7=1628.3
487 /( 6 * X) +12-7=1628.3
You need to learn to write in the language of mathematics as well as in English.