Firstly, expand the equation.

Next, move the variable x to the left and all the constant to the right.

Then, solve for x.
It’s 4
7-11= 4
3-7= 4
and so on
Hope it helps:)
Unit rate is in the quantity of one.
2/1 is a unit rate
6/3 is a rate
4/1 is a unit rate
1.5% of 4,000$ is 60$ . 60$ times 3 years = 180$