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16u+(-17u)+(-12u)+9u+(-9u)=-13
We move all terms to the left:
16u+(-17u)+(-12u)+9u+(-9u)-(-13)=0
We add all the numbers together, and all the variables
25u+(-17u)+(-12u)+(-9u)+13=0
We get rid of parentheses
25u-17u-12u-9u+13=0
We add all the numbers together, and all the variables
-13u+13=0
We move all terms containing u to the left, all other terms to the right
-13u=-13
u=-13/-13
u=1
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