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-30=-6+u/4
We move all terms to the left:
-30-(-6+u/4)=0
We add all the numbers together, and all the variables
-(u/4-6)-30=0
We get rid of parentheses
-u/4+6-30=0
We multiply all the terms by the denominator
-u+6*4-30*4=0
We add all the numbers together, and all the variables
-1u-96=0
We move all terms containing u to the left, all other terms to the right
-u=96
u=96/-1
u=-96
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