7% is not important at all, you may replace it with another number.
"也就是说" is the key here.
The whole sentence can be modified as the following and still works:
One of my friends has five kids and only makes ??? a year, but he can still have a decent life. 也就是说,如果一个政府愿意做,它一定能够从一定程度上解决本国人民,特别是低收入人群的最基本的住房需求。
Next, you can choose the citizenship of this friend and make your point.