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d/2+-10=-13
We move all terms to the left:
d/2+-10-(-13)=0
We add all the numbers together, and all the variables
d/2+3=0
We multiply all the terms by the denominator
d+3*2=0
We add all the numbers together, and all the variables
d+6=0
We move all terms containing d to the left, all other terms to the right
d=-6
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