Solve
![1 + 4x = - 5 + 7x](https://tex.z-dn.net/?f=1%20%2B%204x%20%3D%20%20-%205%20%2B%207x)
First, place the unknown x on the left.
![4x - 7x = - 5 - 1](https://tex.z-dn.net/?f=4x%20-%207x%20%3D%20%20-%205%20%20-%201)
Then, solve for x.
Cross multiply 3/10 and x/70. You get 10x=210. Divide by 10 and get x=21. So it drops 21 degrees. 70-21=49.
Yes
-7=4(-3)+5
-7=-12+5
-7=-7
-7=-3-4
-7=-7
Answer:
3 + 9x = 11x - 7
simplify
9x + 3 = 11x - 7
subtract 11x from both sides
-11x -11x
-2x + 3 = -7
get rid of constants first by subtracting by 3 from both sides
-3 -3
-2x = -10
divide both sides by -2 since that is the inverse operation of multiplication
/-2 /-2
X = 5