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+15=-20-4U
We move all terms to the left:
+15-(-20-4U)=0
We add all the numbers together, and all the variables
-(-4U-20)+15=0
We get rid of parentheses
4U+20+15=0
We add all the numbers together, and all the variables
4U+35=0
We move all terms containing U to the left, all other terms to the right
4U=-35
U=-35/4
U=-8+3/4
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