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4/15x+1/5=2/3x
We move all terms to the left:
4/15x+1/5-(2/3x)=0
Domain of the equation: 15x!=0
x!=0/15
x!=0
x∈R
Domain of the equation: 3x)!=0We add all the numbers together, and all the variables
x!=0/1
x!=0
x∈R
4/15x-(+2/3x)+1/5=0
We get rid of parentheses
4/15x-2/3x+1/5=0
We calculate fractions
135x^2/1125x^2+300x/1125x^2+(-750x)/1125x^2=0
We multiply all the terms by the denominator
135x^2+300x+(-750x)=0
We get rid of parentheses
135x^2+300x-750x=0
We add all the numbers together, and all the variables
135x^2-450x=0
a = 135; b = -450; c = 0;
Δ = b2-4ac
Δ = -4502-4·135·0
Δ = 202500
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{202500}=450$$x_{1}=\frac{-b-\sqrt{\Delta}}{2a}=\frac{-(-450)-450}{2*135}=\frac{0}{270} =0 $$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(-450)+450}{2*135}=\frac{900}{270} =3+1/3 $
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