3more than six times a number is 15

The question is 3 + 6(x) = 15 
so you need to find x 
so you should add -3 on both sides of the equation and you will have:
6(x) = 15 -3 
6(x) = 12 
now you can divide both sides by 6 and you will have:
x = 12/6 
x = 2 :)))
I hope this is helpful
have a nice day

Def is a scalene triangle

Aand b are correctly balanced reactions. they have the same number of atoms in both sides of the reaction