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-4u/7=-28
We move all terms to the left:
-4u/7-(-28)=0
We add all the numbers together, and all the variables
-4u/7+28=0
We multiply all the terms by the denominator
-4u+28*7=0
We add all the numbers together, and all the variables
-4u+196=0
We move all terms containing u to the left, all other terms to the right
-4u=-196
u=-196/-4
u=+49
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