The difference of three times a number and eight is seven. Find the number.

Question

The difference of three times a number and eight is seven. Find the number.

Answer 1

for this you simply set X = to a number

 

x = #

 

then yo create the formula using numbers and symbols instead of words

 

now remember difference means subtraction and the symbol is -

 

so

 

three times a number would be 3x

 

difference between 3x and 8

 

so we write

 

is seven is the same as = 7

 

so when we put the whole thing together we get

 

3x - 8 = 7

 

then we + 8 to both sides

 

3x - 8 + 8 = 7 + 8

 

the 8s on the left cancel out and we are left with

 

3x = 15

 

then simply divide both sides by 3 to get the final answer

 

3x / 3 = 15 / 3

 

the 3s on the left cancel and you get

 

x = 5

 

the answer is 5

Answer 2

for this you simply set X = to a number
x = #
then yo create the formula using numbers and symbols instead of words
now remember difference means subtraction and the symbol is -
so
three times a number would be 3x
difference between 3x and 8
so we write
is seven is the same as = 7
so when we put the whole thing together we get
3x - 8 = 7
then we + 8 to both sides
3x - 8 + 8 = 7 + 8
the 8s on the left cancel out and we are left with
3x = 15
then simply divide both sides by 3 to get the final answer
3x / 3 = 15 / 3
the 3s on the left cancel and you get
x = 5
the answer is 5