18.70
Because they are 1.10 each
Hey!
Let's write it,
![3x-7=4x](https://tex.z-dn.net/?f=3x-7%3D4x)
Add
![7](https://tex.z-dn.net/?f=7)
to both sides,
![3x-7+7=4x+7](https://tex.z-dn.net/?f=3x-7%2B7%3D4x%2B7)
![3x=4x+7](https://tex.z-dn.net/?f=3x%3D4x%2B7)
Subtract
![4x](https://tex.z-dn.net/?f=4x)
from both sides.
![3x-4x=4x+7-4x](https://tex.z-dn.net/?f=3x-4x%3D4x%2B7-4x)
![-x=7](https://tex.z-dn.net/?f=-x%3D7)
Since we don't want a negative variable, we have to divide both sides by
![-1](https://tex.z-dn.net/?f=-1)
.
![\frac{-x}{-1}=\frac{7}{-1}](https://tex.z-dn.net/?f=%5Cfrac%7B-x%7D%7B-1%7D%3D%5Cfrac%7B7%7D%7B-1%7D)
Our answer would be,
![x=-7](https://tex.z-dn.net/?f=x%3D-7)
Thanks!
-TetraFish
Answer:
X=132-13A/A, A cannot equal 0
A=132/X+13, X cannot equal -13
504
............................................................
7+(10−4)2:4⋅231=7+62:4⋅81=7+36:4⋅81=7+9⋅81=7+89=7+181=881