Translate "4 added to 5 times a number is 34" into the following equation:

Then solve. Start by subtracting the 4 from each side:

Then divide both sides by 5:

Check this answer by plugging it back into the original statement:
"4 is added to 5 times 6 is 34"
5 times 6 is 30, and 4 added to that is 34. So it all works out.
The number is 6.