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-10u+(-u)+19u+7u=15
We move all terms to the left:
-10u+(-u)+19u+7u-(15)=0
We add all the numbers together, and all the variables
-10u+(-1u)+19u+7u-15=0
We add all the numbers together, and all the variables
16u+(-1u)-15=0
We get rid of parentheses
16u-1u-15=0
We add all the numbers together, and all the variables
15u-15=0
We move all terms containing u to the left, all other terms to the right
15u=15
u=15/15
u=1
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