15=7(15+x)

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Solution for 15=7(15+x) equation: 



15=7(15+x)

We move all terms to the left:

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

We add all the numbers together, and all the variables

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



We calculate terms in parentheses: -(7(x+15)), so:

7(x+15)

We multiply parentheses

7x+105

Back to the equation:

-(7x+105)



We get rid of parentheses

-7x-105+15=0

We add all the numbers together, and all the variables

-7x-90=0

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

-7x=90

x=90/-7

x=-12+6/7

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