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6x-1=-(5x+21)
We move all terms to the left:
6x-1-(-(5x+21))=0
We calculate terms in parentheses: -(-(5x+21)), so:We get rid of parentheses
-(5x+21)
We get rid of parentheses
-5x-21
Back to the equation:
-(-5x-21)
6x+5x+21-1=0
We add all the numbers together, and all the variables
11x+20=0
We move all terms containing x to the left, all other terms to the right
11x=-20
x=-20/11
x=-1+9/11
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