7,5+15,3:1,5

To solve the expression \( 7.5 + 15.3 \div 1.5 \), you should follow the order of operations (PEMDAS/BODMAS: Parentheses/Brackets, Exponents/Orders, Multiplication and Division (from left to right), Addition and Subtraction (from left to right)).

1. First, perform the division: \[ 15.3 \div 1.5 = 10.2 \]

2. Now, add the result to \( 7.5 \): \[ 7.5 + 10.2 = 17.7 \]

So, the final result is \( 17.7 \).