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-19=-2x-4
We move all terms to the left:
-19-(-2x-4)=0
We get rid of parentheses
2x+4-19=0
We add all the numbers together, and all the variables
2x-15=0
We move all terms containing x to the left, all other terms to the right
2x=15
x=15/2
x=7+1/2
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