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Home > MC1 > Chapter 10 > Lesson 10.1.2 > Problem 10-25

10-25.

If 4k + 1 = −7, then 4k = −8.
Why does this make sense?

If 4k = −8, what must k be equal to?
Try setting up a diagram to figure it out.

k = −2

What do you need to subtract from 30 to get 10?
How can you use this to help figure out the value of x?