(21x-12)+(10x+9)+(8x)+(90)=360

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Solution for (21x-12)+(10x+9)+(8x)+(90)=360 equation: 



(21x-12)+(10x+9)+(8x)+(90)=360

We move all terms to the left:

(21x-12)+(10x+9)+(8x)+(90)-(360)=0

We add all the numbers together, and all the variables

8x+(21x-12)+(10x+9)-270=0

We get rid of parentheses

8x+21x+10x-12+9-270=0

We add all the numbers together, and all the variables

39x-273=0

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

39x=273

x=273/39

x=7

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