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Addition. Start with nothing. Add 10. Subtract 10. Or first subtract 10, then add 10. Result is back where you started.
If the fractions have the same denominator, add and subtract the numerators as if the denominators weren't there and put the result over that denominator. Reduce if possible. If the fractions have different denominators, find the LCM of the denominators and convert the fractions to equivalent fractions with like denominators. Then add and subtract the numerators as if the denominators weren't there and put the result over that denominator. Reduce if possible.
The opposite of add is subtract.
You add or subtract only the numerators
By the signs: 2+2(Add) 2-2(Subtract) +=add -=subtract