Subbing in numbers to a set of solved simultaneous equations

I have the following set of equations (a,b,c) which all depend on some value x. The equations are defined in terms of 3 variables (d,e,f). I can solve the equations to find expressions for d, e and f in terms of a, b and c. I would now like to sub in multiple values of x, obtain values of a, b and c then use these to evaluate d, e and f. I hope this makes sense.

Please can someone tell me how to do this and then save the data in a csv with columns, x, a, b, c , d, e and f. Thanks very much for the help.

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