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2(x-2)-19=-21
We move all terms to the left:
2(x-2)-19-(-21)=0
We add all the numbers together, and all the variables
2(x-2)+2=0
We multiply parentheses
2x-4+2=0
We add all the numbers together, and all the variables
2x-2=0
We move all terms containing x to the left, all other terms to the right
2x=2
x=2/2
x=1
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