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12u-19=4u+13
We move all terms to the left:
12u-19-(4u+13)=0
We get rid of parentheses
12u-4u-13-19=0
We add all the numbers together, and all the variables
8u-32=0
We move all terms containing u to the left, all other terms to the right
8u=32
u=32/8
u=4
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