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-6u-15=15-8u+14u
We move all terms to the left:
-6u-15-(15-8u+14u)=0
We add all the numbers together, and all the variables
-6u-(6u+15)-15=0
We get rid of parentheses
-6u-6u-15-15=0
We add all the numbers together, and all the variables
-12u-30=0
We move all terms containing u to the left, all other terms to the right
-12u=30
u=30/-12
u=-2+1/2
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