15+3(3u-1)=16-(20-7)

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Solution for 15+3(3u-1)=16-(20-7) equation: 



15+3(3u-1)=16-(20-7)

We move all terms to the left:

15+3(3u-1)-(16-(20-7))=0

We add all the numbers together, and all the variables

3(3u-1)+15-(16-13)=0

We add all the numbers together, and all the variables

3(3u-1)+12=0

We multiply parentheses

9u-3+12=0

We add all the numbers together, and all the variables

9u+9=0

We move all terms containing u to the left, all other terms to the right

9u=-9

u=-9/9

u=-1

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