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8u-78=2u-12
We move all terms to the left:
8u-78-(2u-12)=0
We get rid of parentheses
8u-2u+12-78=0
We add all the numbers together, and all the variables
6u-66=0
We move all terms containing u to the left, all other terms to the right
6u=66
u=66/6
u=11
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