x+(3x+21)=180

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Solution for x+(3x+21)=180 equation: 



x+(3x+21)=180

We move all terms to the left:

x+(3x+21)-(180)=0

We get rid of parentheses

x+3x+21-180=0

We add all the numbers together, and all the variables

4x-159=0

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

4x=159

x=159/4

x=39+3/4

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