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-7(6+d)=45
We move all terms to the left:
-7(6+d)-(45)=0
We add all the numbers together, and all the variables
-7(d+6)-45=0
We multiply parentheses
-7d-42-45=0
We add all the numbers together, and all the variables
-7d-87=0
We move all terms containing d to the left, all other terms to the right
-7d=87
d=87/-7
d=-12+3/7
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