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5.43+12.3u=-13.5u+10.59
We move all terms to the left:
5.43+12.3u-(-13.5u+10.59)=0
We get rid of parentheses
12.3u+13.5u-10.59+5.43=0
We add all the numbers together, and all the variables
25.8u-5.16=0
We move all terms containing u to the left, all other terms to the right
25.8u=5.16
u=5.16/25.8
u=1/5
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