Ineed in my adding and/or subtracting fractions

First, you have to make sure that two fractions have the same denominator. he best way to do that is:
For Example:     4          7          8          7
                           +    =    +  
                         10        20        20        20

Then, just add or subtract the numerators and you got your answer.

Boom.

All points to the left of zero on a horizontal number line are negative. a number line is a picture of a graduated straight line that serves as abstraction for real numbers. this number line can be extended to the left to represent numbers which are smaller than 0. such numbers are called negative numbersmark me brainliest