-21=4+-5u

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Solution for -21=4+-5u equation:



-21=4+-5u
We move all terms to the left:
-21-(4+-5u)=0
We add all the numbers together, and all the variables
-(-5u)-21=0
We get rid of parentheses
5u-21=0
We move all terms containing u to the left, all other terms to the right
5u=21
u=21/5
u=4+1/5

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