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10(5+5u)=7u
We move all terms to the left:
10(5+5u)-(7u)=0
We add all the numbers together, and all the variables
10(5u+5)-7u=0
We add all the numbers together, and all the variables
-7u+10(5u+5)=0
We multiply parentheses
-7u+50u+50=0
We add all the numbers together, and all the variables
43u+50=0
We move all terms containing u to the left, all other terms to the right
43u=-50
u=-50/43
u=-1+7/43
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