Question 175496
Collect "like terms" on the same side of the equation

You do this by adding or subtracting the same term on each side of the equation

27+u=3-3u

Add 3u to both sides of the equation

27+u+3u=3-3u+3u

We now have

27+4u=3

Subtract 27 from both sides of the equation

27+4y-27=3-27

Do the arithmetic

4u=-24

Solve for u by dividing each side of the equation by 4

So u=-6

I hope that this helps