7(-7+2x)=21

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Solution for 7(-7+2x)=21 equation: 



7(-7+2x)=21

We move all terms to the left:

7(-7+2x)-(21)=0

We add all the numbers together, and all the variables

7(2x-7)-21=0

We multiply parentheses

14x-49-21=0

We add all the numbers together, and all the variables

14x-70=0

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

14x=70

x=70/14

x=5

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