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

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



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

We move all terms to the left:

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

We add all the numbers together, and all the variables

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

We multiply parentheses

-9x-(5(-2x+21)+9)+117-4=0



We calculate terms in parentheses: -(5(-2x+21)+9), so:

5(-2x+21)+9

We multiply parentheses

-10x+105+9

We add all the numbers together, and all the variables

-10x+114

Back to the equation:

-(-10x+114)



We add all the numbers together, and all the variables

-9x-(-10x+114)+113=0

We get rid of parentheses

-9x+10x-114+113=0

We add all the numbers together, and all the variables

x-1=0

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

x=1

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