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

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



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

We move all terms to the left:

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

We add all the numbers together, and all the variables

3(x+3)-(7(-1x+7))=0

We multiply parentheses

3x-(7(-1x+7))+9=0



We calculate terms in parentheses: -(7(-1x+7)), so:

7(-1x+7)

We multiply parentheses

-7x+49

Back to the equation:

-(-7x+49)



We get rid of parentheses

3x+7x-49+9=0

We add all the numbers together, and all the variables

10x-40=0

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

10x=40

x=40/10

x=4

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