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u+48=4u-42+2u
We move all terms to the left:
u+48-(4u-42+2u)=0
We add all the numbers together, and all the variables
u-(6u-42)+48=0
We get rid of parentheses
u-6u+42+48=0
We add all the numbers together, and all the variables
-5u+90=0
We move all terms containing u to the left, all other terms to the right
-5u=-90
u=-90/-5
u=+18
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