Final answer:
The simplified form of the rational expression 5x - 5 / 3x + 3x is A. 5(x + 1) / 3x.
Step-by-step explanation:
A mathematical expression is a combination of numbers, symbols, and operators that represents a mathematical relationship or operation. It can include variables, constants, and functions, following specific rules and conventions to convey mathematical ideas or solve problems.
The simplified form of the rational expression 5x - 5 / 3x + 3x is: 5(x + 1) / 3x. To simplify the expression, we can factor out a common factor from the numerator and denominator. In this case, the common factor is 5. By factoring out 5, we get:
5(x - 1) / 3(x + 1)
This expression cannot be simplified any further, so the correct answer is Option A.