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9=-d+13
We move all terms to the left:
9-(-d+13)=0
We add all the numbers together, and all the variables
-(-1d+13)+9=0
We get rid of parentheses
1d-13+9=0
We add all the numbers together, and all the variables
d-4=0
We move all terms containing d to the left, all other terms to the right
d=4
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