A=7c-3 b=7- 1 1c can be calculated.

So m = 21c-9+7-1kloc-0/c-7c = 3c-2.

Because 7c-3 >: equals 0 7-11c >; Equal to 0 degrees Celsius & gt equal to 0

So c takes 3/7 as the minimum value.

So the minimum value is -9/7.