Question

find the errors what equation do you get when you solve each equation for x​

Answer 1

Answer:

Error in the third line.

Step-by-step explanation:

There is an error in the third line.

We are dividing through by 7 but  mx is not divided by 7.

Correct solution  is:

mx + 7nx =7

x(m + 7n) =  7

x = 7 / (m + 7n).