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2x+9=-15.
We move all terms to the left:
2x+9-(-15.)=0
We add all the numbers together, and all the variables
2x+9-(-15)=0
We add all the numbers together, and all the variables
2x+24=0
We move all terms containing x to the left, all other terms to the right
2x=-24
x=-24/2
x=-12
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