Question

I need to find the value of x. But the teacher never told us how to do this! Can anyone help?

Answer 1

First of all, you need to know that a triangle always adds up to 1ip degrees. So, you have to create and equation that goes like this:
7x+11+90+25=180
You combine like-terms so in simplest form its:
7×+126=180
After this you follow the procedure to solving 2-step equations.
If you have any other questions, I'll be happy to help.