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2/3x+1/4x=7/12
We move all terms to the left:
2/3x+1/4x-(7/12)=0
Domain of the equation: 3x!=0
x!=0/3
x!=0
x∈R
Domain of the equation: 4x!=0We add all the numbers together, and all the variables
x!=0/4
x!=0
x∈R
2/3x+1/4x-(+7/12)=0
We get rid of parentheses
2/3x+1/4x-7/12=0
We calculate fractions
(-336x^2)/144x^2+96x/144x^2+36x/144x^2=0
We multiply all the terms by the denominator
(-336x^2)+96x+36x=0
We add all the numbers together, and all the variables
(-336x^2)+132x=0
We get rid of parentheses
-336x^2+132x=0
a = -336; b = 132; c = 0;
Δ = b2-4ac
Δ = 1322-4·(-336)·0
Δ = 17424
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{17424}=132$$x_{1}=\frac{-b-\sqrt{\Delta}}{2a}=\frac{-(132)-132}{2*-336}=\frac{-264}{-672} =11/28 $$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(132)+132}{2*-336}=\frac{0}{-672} =0 $
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