(21x+4)+(9x-4)=180

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Solution for (21x+4)+(9x-4)=180 equation: 



(21x+4)+(9x-4)=180

We move all terms to the left:

(21x+4)+(9x-4)-(180)=0

We get rid of parentheses

21x+9x+4-4-180=0

We add all the numbers together, and all the variables

30x-180=0

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

30x=180

x=180/30

x=6

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