Answer:
x=3
Step-by-step explanation:
The approach is not very different from regular fractions.
You have to get to a common denominator to be able to add them.
10 is a good denominator (multiply the denominators).
multiply the first term by 5, and the second one by 2:
[tex]\frac{5 \cdot (x+1)}{5 \cdot 2} + \frac{2 \cdot (x+2)}{2 \cdot 5} = 3[/tex]
[tex]\frac{5x+5 + 2x+4}{10} = 3[/tex]
[tex]\frac{7x+9}{10} = 3[/tex]
7x + 9 = 30
7x = 30 - 9
x = 3
let me know if you need more details on one of the steps
