7x-15=(3x+x)+(18+6)

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Solution for 7x-15=(3x+x)+(18+6) equation: 



7x-15=(3x+x)+(18+6)

We move all terms to the left:

7x-15-((3x+x)+(18+6))=0

We add all the numbers together, and all the variables

7x-((+4x)+24)-15=0



We calculate terms in parentheses: -((+4x)+24), so:

(+4x)+24

We get rid of parentheses

4x+24

Back to the equation:

-(4x+24)



We get rid of parentheses

7x-4x-24-15=0

We add all the numbers together, and all the variables

3x-39=0

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

3x=39

x=39/3

x=13

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