-4u=-840

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Solution for -4u=-840 equation: 



-4u=-840

We move all terms to the left:

-4u-(-840)=0

We add all the numbers together, and all the variables

-4u+840=0

We move all terms containing u to the left, all other terms to the right

-4u=-840

u=-840/-4

u=+210

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