Question

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

Answer 1

Error in the third line.

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).