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2d+5=3-7
We move all terms to the left:
2d+5-(3-7)=0
We add all the numbers together, and all the variables
2d+5-(-4)=0
We add all the numbers together, and all the variables
2d+9=0
We move all terms containing d to the left, all other terms to the right
2d=-9
d=-9/2
d=-4+1/2
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