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(d-7)(d+4/3)=0
We add all the numbers together, and all the variables
(d-7)(+d+4/3)=0
We multiply parentheses ..
(+d^2+4d^2-7d-7*4/3)=0
We multiply all the terms by the denominator
(+d^2+4d^2-7d-7*4=0
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