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x+(2x+3)=-4
We move all terms to the left:
x+(2x+3)-(-4)=0
We add all the numbers together, and all the variables
x+(2x+3)+4=0
We get rid of parentheses
x+2x+3+4=0
We add all the numbers together, and all the variables
3x+7=0
We move all terms containing x to the left, all other terms to the right
3x=-7
x=-7/3
x=-2+1/3
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