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94=4u-90
We move all terms to the left:
94-(4u-90)=0
We get rid of parentheses
-4u+90+94=0
We add all the numbers together, and all the variables
-4u+184=0
We move all terms containing u to the left, all other terms to the right
-4u=-184
u=-184/-4
u=+46
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