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-19+4u=9(8u+2)
We move all terms to the left:
-19+4u-(9(8u+2))=0
We calculate terms in parentheses: -(9(8u+2)), so:We get rid of parentheses
9(8u+2)
We multiply parentheses
72u+18
Back to the equation:
-(72u+18)
4u-72u-18-19=0
We add all the numbers together, and all the variables
-68u-37=0
We move all terms containing u to the left, all other terms to the right
-68u=37
u=37/-68
u=-37/68
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