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5/x+1/3x-4=12
We move all terms to the left:
5/x+1/3x-4-(12)=0
Domain of the equation: x!=0
x∈R
Domain of the equation: 3x!=0We add all the numbers together, and all the variables
x!=0/3
x!=0
x∈R
5/x+1/3x-16=0
We calculate fractions
15x/3x^2+x/3x^2-16=0
We multiply all the terms by the denominator
15x+x-16*3x^2=0
We add all the numbers together, and all the variables
16x-16*3x^2=0
Wy multiply elements
-48x^2+16x=0
a = -48; b = 16; c = 0;
Δ = b2-4ac
Δ = 162-4·(-48)·0
Δ = 256
The delta value is higher than zero, so the equation has two solutions
We use following formulas to calculate our solutions:$x_{1}=\frac{-b-\sqrt{\Delta}}{2a}$$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}$$\sqrt{\Delta}=\sqrt{256}=16$$x_{1}=\frac{-b-\sqrt{\Delta}}{2a}=\frac{-(16)-16}{2*-48}=\frac{-32}{-96} =1/3 $$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(16)+16}{2*-48}=\frac{0}{-96} =0 $
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