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-18=-10+4u
We move all terms to the left:
-18-(-10+4u)=0
We add all the numbers together, and all the variables
-(4u-10)-18=0
We get rid of parentheses
-4u+10-18=0
We add all the numbers together, and all the variables
-4u-8=0
We move all terms containing u to the left, all other terms to the right
-4u=8
u=8/-4
u=-2
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