It really depends on what type of symbol you use (ex. X + - /), but for division you can move the decimal place over for both numbers (the dividend and the divisor) until both numbers are whole and do normal division and then after you would count how many places you moved the decimal place and move the decimal place that many times (to the left) to get your answer.
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The answer depends on the equation: there is no single method which can be used for all equations.
Decimals are simply a way to express numbers. There is nothing to solve!
Tell me the equations first.
You need as many equations as you have variables.
You can solve the system of equations with three variables using the substitute method, or using matrix operations.