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2x+9=-15-(2x)
We move all terms to the left:
2x+9-(-15-(2x))=0
We add all the numbers together, and all the variables
2x-(-2x-15)+9=0
We get rid of parentheses
2x+2x+15+9=0
We add all the numbers together, and all the variables
4x+24=0
We move all terms containing x to the left, all other terms to the right
4x=-24
x=-24/4
x=-6
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