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X+4=2X+19
We move all terms to the left:
X+4-(2X+19)=0
We get rid of parentheses
X-2X-19+4=0
We add all the numbers together, and all the variables
-1X-15=0
We move all terms containing X to the left, all other terms to the right
-X=15
X=15/-1
X=-15
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