Please, solve this equation

(x) / (x + 4.5) = 2/7
In detail
I know it's equal to 1.8
BUT I WANT TO KNOW HOW IT CAME (1.8)

Once you have it set up, cross multiply them and set them equal to each other.
Then solve for x.
(x+4.5)(2) gives you 2x+9 and
(x)(7) gives you 7x so you're left with
2x+9=7x
Subtract 2x from both sides leaving you with
9=5x Solve for x by dividing both sides by 5
leaving you with x=9/5 or 1.8

Cross multiply

7x = 2(x + 4.5)

7x = 2x + 9

5x = 9

x = 9/5
x = 1.8

7x = 2x + 9
5x = 9
x = 9/5 or 1.8

Answer: x = 9/5 or 1.8