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12+5(u-5)=-20
We move all terms to the left:
12+5(u-5)-(-20)=0
We add all the numbers together, and all the variables
5(u-5)+32=0
We multiply parentheses
5u-25+32=0
We add all the numbers together, and all the variables
5u+7=0
We move all terms containing u to the left, all other terms to the right
5u=-7
u=-7/5
u=-1+2/5
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