×2-24+12×=12-15×-1×
×2+12×+15×+1×=12+24
30×/30=36/30
×=36/30
Well you see, you have 2/8, (fraction) and here is a few others,
These are COMMON. 4/16, 2/8, 6/24, etc....
You multiply the denominator and numerator by the same answer.
Thats how I think I learned it.
97+ 54= 151
180-151= 29
29 is the answer
To get it equivalent to 1, you want N to equal 4, as 4/4 is 1