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8.7=u/4-2.3
We move all terms to the left:
8.7-(u/4-2.3)=0
We get rid of parentheses
-u/4+2.3+8.7=0
We multiply all the terms by the denominator
-u+(2.3)*4+(8.7)*4=0
We add all the numbers together, and all the variables
-1u+44=0
We move all terms containing u to the left, all other terms to the right
-u=-44
u=-44/-1
u=+44
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