4x+5(21-2x)+9x=9(13-x)

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Solution for 4x+5(21-2x)+9x=9(13-x) equation: 



4x+5(21-2x)+9x=9(13-x)

We move all terms to the left:

4x+5(21-2x)+9x-(9(13-x))=0

We add all the numbers together, and all the variables

4x+5(-2x+21)+9x-(9(-1x+13))=0

We add all the numbers together, and all the variables

13x+5(-2x+21)-(9(-1x+13))=0

We multiply parentheses

13x-10x-(9(-1x+13))+105=0



We calculate terms in parentheses: -(9(-1x+13)), so:

9(-1x+13)

We multiply parentheses

-9x+117

Back to the equation:

-(-9x+117)



We add all the numbers together, and all the variables

3x-(-9x+117)+105=0

We get rid of parentheses

3x+9x-117+105=0

We add all the numbers together, and all the variables

12x-12=0

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

12x=12

x=12/12

x=1

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