x represent a certain number.when the number is multiplied by 3 the result is the same as adding 34 to the number .find x

Just translate the English into Math.

"the number is multiplied by 3" ----> 3x
"the result is the same as" ----> =
"adding 34 to the number" ----> x+34

3x = x+34
2x = 34
x = 17