Multiply all terms by a number (usually a power of 10) large enough to turn all decimal numbers into whole numbers.
For example, take .4x = .75x - 2; multiply everything by 100 (102) to get 40x = 75x - 200.
Obviously, this method won't work with irrational decimals such as pi.
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You can eliminate the fractions before proceeding to solve the equation to allow for easy factorization.
There should be no points after the decimal point.
87.656 87.66
Decimal points aren't positive or negative. Decimals can be either.
Put the numbers in a column with the decimal points aligned. Add the numbers ignoring the decimal points. Insert the decimal point in the answer exactly below the column of decimal points in the numbers being added (summands).