What do you feel would be a minimally acceptable rate of pay?

Of course, this will be really dependent on the type of job that you do and the state where you live.
Take me for example. I'm an accountant that live in Manhattan. Since it's generally more expensive compared than other state and accounting is considered a pretty high-skilled job, i would accept no less than $ 35 per hour.

X/7 = 18/21
Lets Reduce:
21/7=3 so we know for every 3 in 18/21 we have one in x/7
This means 6/7=18/21
Check:
18/6=3
21/7=3