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6.4u-1.5u=-3.12
We move all terms to the left:
6.4u-1.5u-(-3.12)=0
We add all the numbers together, and all the variables
4.9u+3.12=0
We move all terms containing u to the left, all other terms to the right
4.9u=-3.12
u=-3.12/4.9
u=-2.7857142857143/4.375
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