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10+9(12+d)=37
We move all terms to the left:
10+9(12+d)-(37)=0
We add all the numbers together, and all the variables
9(d+12)+10-37=0
We add all the numbers together, and all the variables
9(d+12)-27=0
We multiply parentheses
9d+108-27=0
We add all the numbers together, and all the variables
9d+81=0
We move all terms containing d to the left, all other terms to the right
9d=-81
d=-81/9
d=-9
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