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23(7-d)+10d=213
We move all terms to the left:
23(7-d)+10d-(213)=0
We add all the numbers together, and all the variables
23(-1d+7)+10d-213=0
We add all the numbers together, and all the variables
10d+23(-1d+7)-213=0
We multiply parentheses
10d-23d+161-213=0
We add all the numbers together, and all the variables
-13d-52=0
We move all terms containing d to the left, all other terms to the right
-13d=52
d=52/-13
d=-4
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