Question 9131
Mom, I think this is too many to solve.  I will do the first to and show you and  you can continue the rest.

can'tsolve 13+c=-38 = All you want to do is move the number, not the c(called the variable) to the right of the equal sign.

{{{13+c=-13}}} You would subtract the opposite, so if it is a positive 13, it become a negative 13.  To get a variable alone, you must move all the number to the the side of equal sign
{{{c=-26}}}

{{{w+14=-8}}}
{{{w=22}}}

{{{4.2=n+7.3}}}
{{{-3.1=n}}}

Hopefully this helps you
CharStar