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