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3/4x+9/10-4/5x=0
Domain of the equation: 4x!=0
x!=0/4
x!=0
x∈R
Domain of the equation: 5x!=0We calculate fractions
x!=0/5
x!=0
x∈R
900x^2/200x^2+150x/200x^2+(-160x)/200x^2=0
We multiply all the terms by the denominator
900x^2+150x+(-160x)=0
We get rid of parentheses
900x^2+150x-160x=0
We add all the numbers together, and all the variables
900x^2-10x=0
a = 900; b = -10; c = 0;
Δ = b2-4ac
Δ = -102-4·900·0
Δ = 100
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{100}=10$$x_{1}=\frac{-b-\sqrt{\Delta}}{2a}=\frac{-(-10)-10}{2*900}=\frac{0}{1800} =0 $$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(-10)+10}{2*900}=\frac{20}{1800} =1/90 $
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