7x-2(x-3)=21

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Solution for 7x-2(x-3)=21 equation: 



7x-2(x-3)=21

We move all terms to the left:

7x-2(x-3)-(21)=0

We multiply parentheses

7x-2x+6-21=0

We add all the numbers together, and all the variables

5x-15=0

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

5x=15

x=15/5

x=3

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