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2(2+1)=x+4
We move all terms to the left:
2(2+1)-(x+4)=0
We add all the numbers together, and all the variables
-(x+4)+23=0
We get rid of parentheses
-x-4+23=0
We add all the numbers together, and all the variables
-1x+19=0
We move all terms containing x to the left, all other terms to the right
-x=-19
x=-19/-1
x=+19
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