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6.4u-5.1u=3.25
We move all terms to the left:
6.4u-5.1u-(3.25)=0
We add all the numbers together, and all the variables
1.3u-3.25=0
We move all terms containing u to the left, all other terms to the right
1.3u=3.25
u=3.25/1.3
u=2+0.65/1.3
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