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43=7d+8
We move all terms to the left:
43-(7d+8)=0
We get rid of parentheses
-7d-8+43=0
We add all the numbers together, and all the variables
-7d+35=0
We move all terms containing d to the left, all other terms to the right
-7d=-35
d=-35/-7
d=+5
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