8x-7(2x-9)=21

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Solution for 8x-7(2x-9)=21 equation: 



8x-7(2x-9)=21

We move all terms to the left:

8x-7(2x-9)-(21)=0

We multiply parentheses

8x-14x+63-21=0

We add all the numbers together, and all the variables

-6x+42=0

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

-6x=-42

x=-42/-6

x=+7

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