90+(x+4)+(8x-4)=180

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Solution for 90+(x+4)+(8x-4)=180 equation: 



90+(x+4)+(8x-4)=180

We move all terms to the left:

90+(x+4)+(8x-4)-(180)=0

We add all the numbers together, and all the variables

(x+4)+(8x-4)-90=0

We get rid of parentheses

x+8x+4-4-90=0

We add all the numbers together, and all the variables

9x-90=0

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

9x=90

x=90/9

x=10

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