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14d-1/3(15-12d)=13
We move all terms to the left:
14d-1/3(15-12d)-(13)=0
Domain of the equation: 3(15-12d)!=0We add all the numbers together, and all the variables
d∈R
14d-1/3(-12d+15)-13=0
We multiply all the terms by the denominator
14d*3(-12d+15)-13*3(-12d+15)-1=0
Wy multiply elements
42d^2(--39d(--1=0
We use the square of the difference formula
42d^2(+39d(+1=0
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