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7/5x-3=5/4x
We move all terms to the left:
7/5x-3-(5/4x)=0
Domain of the equation: 5x!=0
x!=0/5
x!=0
x∈R
Domain of the equation: 4x)!=0We add all the numbers together, and all the variables
x!=0/1
x!=0
x∈R
7/5x-(+5/4x)-3=0
We get rid of parentheses
7/5x-5/4x-3=0
We calculate fractions
28x/20x^2+(-25x)/20x^2-3=0
We multiply all the terms by the denominator
28x+(-25x)-3*20x^2=0
Wy multiply elements
-60x^2+28x+(-25x)=0
We get rid of parentheses
-60x^2+28x-25x=0
We add all the numbers together, and all the variables
-60x^2+3x=0
a = -60; b = 3; c = 0;
Δ = b2-4ac
Δ = 32-4·(-60)·0
Δ = 9
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{9}=3$$x_{1}=\frac{-b-\sqrt{\Delta}}{2a}=\frac{-(3)-3}{2*-60}=\frac{-6}{-120} =1/20 $$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(3)+3}{2*-60}=\frac{0}{-120} =0 $
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