3(x+7)=78

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Solution for 3(x+7)=78 equation: 



3(x+7)=78

We move all terms to the left:

3(x+7)-(78)=0

We multiply parentheses

3x+21-78=0

We add all the numbers together, and all the variables

3x-57=0

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

3x=57

x=57/3

x=19

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