7(3x+15)=21

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Solution for 7(3x+15)=21 equation: 



7(3x+15)=21

We move all terms to the left:

7(3x+15)-(21)=0

We multiply parentheses

21x+105-21=0

We add all the numbers together, and all the variables

21x+84=0

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

21x=-84

x=-84/21

x=-4

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