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-7u+3(u-4)=-32
We move all terms to the left:
-7u+3(u-4)-(-32)=0
We add all the numbers together, and all the variables
-7u+3(u-4)+32=0
We multiply parentheses
-7u+3u-12+32=0
We add all the numbers together, and all the variables
-4u+20=0
We move all terms containing u to the left, all other terms to the right
-4u=-20
u=-20/-4
u=+5
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