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-4(d-7)=524
We move all terms to the left:
-4(d-7)-(524)=0
We multiply parentheses
-4d+28-524=0
We add all the numbers together, and all the variables
-4d-496=0
We move all terms containing d to the left, all other terms to the right
-4d=496
d=496/-4
d=-124
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