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z/3z+8=4z+9
We move all terms to the left:
z/3z+8-(4z+9)=0
Domain of the equation: 3z!=0We get rid of parentheses
z!=0/3
z!=0
z∈R
z/3z-4z-9+8=0
We multiply all the terms by the denominator
z-4z*3z-9*3z+8*3z=0
Wy multiply elements
-12z^2+z-27z+24z=0
We add all the numbers together, and all the variables
-12z^2-2z=0
a = -12; b = -2; c = 0;
Δ = b2-4ac
Δ = -22-4·(-12)·0
Δ = 4
The delta value is higher than zero, so the equation has two solutions
We use following formulas to calculate our solutions:$z_{1}=\frac{-b-\sqrt{\Delta}}{2a}$$z_{2}=\frac{-b+\sqrt{\Delta}}{2a}$$\sqrt{\Delta}=\sqrt{4}=2$$z_{1}=\frac{-b-\sqrt{\Delta}}{2a}=\frac{-(-2)-2}{2*-12}=\frac{0}{-24} =0 $$z_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(-2)+2}{2*-12}=\frac{4}{-24} =-1/6 $
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