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21-2(5x-7)+1=80+x
We move all terms to the left:
21-2(5x-7)+1-(80+x)=0
We add all the numbers together, and all the variables
-2(5x-7)-(x+80)+21+1=0
We add all the numbers together, and all the variables
-2(5x-7)-(x+80)+22=0
We multiply parentheses
-10x-(x+80)+14+22=0
We get rid of parentheses
-10x-x-80+14+22=0
We add all the numbers together, and all the variables
-11x-44=0
We move all terms containing x to the left, all other terms to the right
-11x=44
x=44/-11
x=-4
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