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11(d+339)=770
We move all terms to the left:
11(d+339)-(770)=0
We multiply parentheses
11d+3729-770=0
We add all the numbers together, and all the variables
11d+2959=0
We move all terms containing d to the left, all other terms to the right
11d=-2959
d=-2959/11
d=-269
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