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7(d+22*7+6/7=7)
We move all terms to the left:
7(d+22*7+6/7-(7))=0
We add all the numbers together, and all the variables
7(d+6/7+147)=0
We multiply parentheses
7d+1029+6/7*7=0
We multiply all the terms by the denominator
7d*7*7+6+1029*7*7=0
We add all the numbers together, and all the variables
7d*7*7+50427=0
Wy multiply elements
343d*7+50427=0
Wy multiply elements
2401d+50427=0
We move all terms containing d to the left, all other terms to the right
2401d=-50427
d=-50427/2401
d=-21+6/2401
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