ABSTRACT
Equation Ax + B = C has a general solution: x= (CB)/A.
Special cases: if C=0, x= B/A;
if A=0 there is no solution (x=infinity).
USAGE
Enter the coefficients A, B, C in input boxes 
could be any combination of Decimals, Fractions and Mixed Numbers, positive or negative,
then click on [SOLVE] button to get a solution for X as a Fraction and equivalent Decimal.
The following rules apply:

If Text Box A is empty, system will assigns 1

Text Boxes B, C must contain a number or 0
For example, 2x + 0.5 = 3/4 has a solution: x = 1/8 (0.125)