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-2(x+19)=4
We move all terms to the left:
-2(x+19)-(4)=0
We multiply parentheses
-2x-38-4=0
We add all the numbers together, and all the variables
-2x-42=0
We move all terms containing x to the left, all other terms to the right
-2x=42
x=42/-2
x=-21
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