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## Homework Statement

7((45y + 30)/14) + 9y = 225

the next line reads

45y + 30 + 18y = 450

Where did the 7 go? What was divided by 14?

I'm not sure how this part was done, I undertand how to get the rest though...

## Homework Equations

7((45y + 30)/14) + 9y = 2257((45y + 30)/14) + 9y = 225

## The Attempt at a Solution

I can get the rest, but I simply have no idea how this part was done (it was example in book). It appers to inverse 7/14 and multiply it by 9y, but I don't know why...

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