3(u+7)-5u=13

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Solution for 3(u+7)-5u=13 equation: 



3(u+7)-5u=13

We move all terms to the left:

3(u+7)-5u-(13)=0

We add all the numbers together, and all the variables

-5u+3(u+7)-13=0

We multiply parentheses

-5u+3u+21-13=0

We add all the numbers together, and all the variables

-2u+8=0

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

-2u=-8

u=-8/-2

u=+4

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