p4 + 3O2 ---> 2PO3
12 + 5 equals...
-12 (?)
12/3 = 4
25
To solve this, you should first write it as an equation (where 'x' is the unknown value):8x = 12Then you can solve for x:8x =12X = 12/8X=1.5
Add 12 to each side: a = 36 + 12 = 48
If n + 7 = 12, then n = 12 - 7
3x=12 3x/3=12/3 x=4
x=12
-0.5
x=12