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3(4x-7)=10/x
We move all terms to the left:
3(4x-7)-(10/x)=0
Domain of the equation: x)!=0We add all the numbers together, and all the variables
x!=0/1
x!=0
x∈R
3(4x-7)-(+10/x)=0
We multiply parentheses
12x-(+10/x)-21=0
We get rid of parentheses
12x-10/x-21=0
We multiply all the terms by the denominator
12x*x-21*x-10=0
We add all the numbers together, and all the variables
-21x+12x*x-10=0
Wy multiply elements
12x^2-21x-10=0
a = 12; b = -21; c = -10;
Δ = b2-4ac
Δ = -212-4·12·(-10)
Δ = 921
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}$$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}$$x_{1}=\frac{-b-\sqrt{\Delta}}{2a}=\frac{-(-21)-\sqrt{921}}{2*12}=\frac{21-\sqrt{921}}{24} $$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(-21)+\sqrt{921}}{2*12}=\frac{21+\sqrt{921}}{24} $
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