Identify Order of Operations: Identify the order of operations to solve the expression.According to the order of operations (PEMDAS/BODMAS), we must first calculate the expression inside the parentheses, then perform division, and finally addition.
Calculate Inside Parentheses: Calculate the expression inside the parentheses 0.7−0.9. −0.7−0.9=−0.2
Perform Division: Perform the division with the result from the previous step. 0.2÷(−0.2)=−1
Add Result to 0.1: Add the result of the division to 0.1. 0.1+(−1)=0.1−1=−0.9