(4x+21)+(9x-9)=155

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Solution for (4x+21)+(9x-9)=155 equation: 



(4x+21)+(9x-9)=155

We move all terms to the left:

(4x+21)+(9x-9)-(155)=0

We get rid of parentheses

4x+9x+21-9-155=0

We add all the numbers together, and all the variables

13x-143=0

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

13x=143

x=143/13

x=11

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