1. ## equation

d-4=7

c-34=20

a-4= -18

2. Originally Posted by dianna
d-4=7

c-34=20

a-4= -18
Hello, Dianna,

CaptainBlack and topsquark have already explained how to solve those equations. Look here: http://www.mathhelpforum.com/math-he...-equation.html

If you are not certain what to do use the following method:
Code:
     d - 4 = 7
+ 4 | +4            add 4 on both sides
--------------           to get rid of the -4
d     = 11
Use this method to solve the next 2 equations.

(For confirmation only: c = 54; a = -14)

EB

PS.: You have published 10 more or less identical problems without a hint how we can help you. So I'm not quite certain that I could help you with this post.