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x+4=-2x=19
We move all terms to the left:
x+4-(-2x)=0
We get rid of parentheses
x+2x+4=0
We add all the numbers together, and all the variables
3x+4=0
We move all terms containing x to the left, all other terms to the right
3x=-4
x=-4/3
x=-1+1/3
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