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1/5x-4=3/4x+1
We move all terms to the left:
1/5x-4-(3/4x+1)=0
Domain of the equation: 5x!=0
x!=0/5
x!=0
x∈R
Domain of the equation: 4x+1)!=0We get rid of parentheses
x∈R
1/5x-3/4x-1-4=0
We calculate fractions
4x/20x^2+(-15x)/20x^2-1-4=0
We add all the numbers together, and all the variables
4x/20x^2+(-15x)/20x^2-5=0
We multiply all the terms by the denominator
4x+(-15x)-5*20x^2=0
Wy multiply elements
-100x^2+4x+(-15x)=0
We get rid of parentheses
-100x^2+4x-15x=0
We add all the numbers together, and all the variables
-100x^2-11x=0
a = -100; b = -11; c = 0;
Δ = b2-4ac
Δ = -112-4·(-100)·0
Δ = 121
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{121}=11$$x_{1}=\frac{-b-\sqrt{\Delta}}{2a}=\frac{-(-11)-11}{2*-100}=\frac{0}{-200} =0 $$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(-11)+11}{2*-100}=\frac{22}{-200} =-11/100 $
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