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X+1=2(X-1)-1
We move all terms to the left:
X+1-(2(X-1)-1)=0
We calculate terms in parentheses: -(2(X-1)-1), so:We get rid of parentheses
2(X-1)-1
We multiply parentheses
2X-2-1
We add all the numbers together, and all the variables
2X-3
Back to the equation:
-(2X-3)
X-2X+3+1=0
We add all the numbers together, and all the variables
-1X+4=0
We move all terms containing X to the left, all other terms to the right
-X=-4
X=-4/-1
X=+4
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