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3x+(2x+1)+21=180
We move all terms to the left:
3x+(2x+1)+21-(180)=0
We add all the numbers together, and all the variables
3x+(2x+1)-159=0
We get rid of parentheses
3x+2x+1-159=0
We add all the numbers together, and all the variables
5x-158=0
We move all terms containing x to the left, all other terms to the right
5x=158
x=158/5
x=31+3/5
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