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-(14x+9)-8(13x+10)-21x-1=55
We move all terms to the left:
-(14x+9)-8(13x+10)-21x-1-(55)=0
We add all the numbers together, and all the variables
-21x-(14x+9)-8(13x+10)-56=0
We multiply parentheses
-21x-(14x+9)-104x-80-56=0
We get rid of parentheses
-21x-14x-104x-9-80-56=0
We add all the numbers together, and all the variables
-139x-145=0
We move all terms containing x to the left, all other terms to the right
-139x=145
x=145/-139
x=-1+6/139
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