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-20=-4+u/4
We move all terms to the left:
-20-(-4+u/4)=0
We add all the numbers together, and all the variables
-(u/4-4)-20=0
We get rid of parentheses
-u/4+4-20=0
We multiply all the terms by the denominator
-u+4*4-20*4=0
We add all the numbers together, and all the variables
-1u-64=0
We move all terms containing u to the left, all other terms to the right
-u=64
u=64/-1
u=-64
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