7(x+15)=3(x+7)

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



7(x+15)=3(x+7)

We move all terms to the left:

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

We multiply parentheses

7x-(3(x+7))+105=0



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

3(x+7)

We multiply parentheses

3x+21

Back to the equation:

-(3x+21)



We get rid of parentheses

7x-3x-21+105=0

We add all the numbers together, and all the variables

4x+84=0

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

4x=-84

x=-84/4

x=-21

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