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(21x+1)+(20x+5)=180
We move all terms to the left:
(21x+1)+(20x+5)-(180)=0
We get rid of parentheses
21x+20x+1+5-180=0
We add all the numbers together, and all the variables
41x-174=0
We move all terms containing x to the left, all other terms to the right
41x=174
x=174/41
x=4+10/41
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