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

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



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

We move all terms to the left:

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

We get rid of parentheses

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



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

(x+3)+(x+3)+(x+3)+(x+3)

We get rid of parentheses

x+x+x+x+3+3+3+3

We add all the numbers together, and all the variables

4x+12

Back to the equation:

-(4x+12)



We add all the numbers together, and all the variables

3x-(4x+12)+21=0

We get rid of parentheses

3x-4x-12+21=0

We add all the numbers together, and all the variables

-1x+9=0

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

-x=-9

x=-9/-1

x=+9

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