(3x=9)(x+7)

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Solution for (3x=9)(x+7) equation: 



(3x=9)(x+7)

We move all terms to the left:

(3x-(9)(x+7))=0



We calculate terms in parentheses: +(3x-9(x+7)), so:

3x-9(x+7)

We multiply parentheses

3x-9x-63

We add all the numbers together, and all the variables

-6x-63

Back to the equation:

+(-6x-63)



We get rid of parentheses

-6x-63=0

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

-6x=63

x=63/-6

x=-10+1/2

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