20=4(15-x)+9x

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Solution for 20=4(15-x)+9x equation: 



20=4(15-x)+9x

We move all terms to the left:

20-(4(15-x)+9x)=0

We add all the numbers together, and all the variables

-(4(-1x+15)+9x)+20=0



We calculate terms in parentheses: -(4(-1x+15)+9x), so:

4(-1x+15)+9x

We add all the numbers together, and all the variables

9x+4(-1x+15)

We multiply parentheses

9x-4x+60

We add all the numbers together, and all the variables

5x+60

Back to the equation:

-(5x+60)



We get rid of parentheses

-5x-60+20=0

We add all the numbers together, and all the variables

-5x-40=0

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

-5x=40

x=40/-5

x=-8

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