13x-45=4(9+x)

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Solution for 13x-45=4(9+x) equation: 



13x-45=4(9+x)

We move all terms to the left:

13x-45-(4(9+x))=0

We add all the numbers together, and all the variables

13x-(4(x+9))-45=0



We calculate terms in parentheses: -(4(x+9)), so:

4(x+9)

We multiply parentheses

4x+36

Back to the equation:

-(4x+36)



We get rid of parentheses

13x-4x-36-45=0

We add all the numbers together, and all the variables

9x-81=0

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

9x=81

x=81/9

x=9

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