-6u - 36 = -42

-6u - 36 + 36 = -42 + 36

-6u = -6

-6u/-6 = -6/-6

u = 1

Original equation:

-6u - 36 = -42

METHOD 1: Add, then divide

Add 36 to both sides:

-6u = -6

Divide both sides by -6:

u = -6/-6

u = 1

METHOD 2: Divide, then subtract

Divide everything by -6:

u + 6 = 7

Subtract 6 from both sides:

u = 1

U = 1 ...........