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3-10u=-9u+6.
We move all terms to the left:
3-10u-(-9u+6.)=0
We add all the numbers together, and all the variables
-10u-(-9u+6)+3=0
We get rid of parentheses
-10u+9u-6+3=0
We add all the numbers together, and all the variables
-1u-3=0
We move all terms containing u to the left, all other terms to the right
-u=3
u=3/-1
u=-3
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