It is not true so you cannot prove it. You can concoct a "proof" that might look OK but it will be flawed.
5/7 is not equal to 12/36.
-19
12 - 7 = 5
-19
-12 + 7 = -5
7
what is d over 12 plus 7 times d over 12 equal
X plus 7-12?
1008.
17
12
12 ft and 7 inches is 151 in.