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+51=6U+3
We move all terms to the left:
+51-(6U+3)=0
We get rid of parentheses
-6U-3+51=0
We add all the numbers together, and all the variables
-6U+48=0
We move all terms containing U to the left, all other terms to the right
-6U=-48
U=-48/-6
U=+8
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