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(-3d/4d+8)+2=5/d+2
We move all terms to the left:
(-3d/4d+8)+2-(5/d+2)=0
Domain of the equation: 4d+8)!=0
d∈R
Domain of the equation: d+2)!=0We get rid of parentheses
d∈R
-3d/4d-5/d+8-2+2=0
We calculate fractions
(-3d^2)/4d^2+(-20d)/4d^2+8-2+2=0
We add all the numbers together, and all the variables
(-3d^2)/4d^2+(-20d)/4d^2+8=0
We multiply all the terms by the denominator
(-3d^2)+(-20d)+8*4d^2=0
Wy multiply elements
(-3d^2)+32d^2+(-20d)=0
We get rid of parentheses
-3d^2+32d^2-20d=0
We add all the numbers together, and all the variables
29d^2-20d=0
a = 29; b = -20; c = 0;
Δ = b2-4ac
Δ = -202-4·29·0
Δ = 400
The delta value is higher than zero, so the equation has two solutions
We use following formulas to calculate our solutions:$d_{1}=\frac{-b-\sqrt{\Delta}}{2a}$$d_{2}=\frac{-b+\sqrt{\Delta}}{2a}$$\sqrt{\Delta}=\sqrt{400}=20$$d_{1}=\frac{-b-\sqrt{\Delta}}{2a}=\frac{-(-20)-20}{2*29}=\frac{0}{58} =0 $$d_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(-20)+20}{2*29}=\frac{40}{58} =20/29 $
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