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3/4x-5/7x=9/14
We move all terms to the left:
3/4x-5/7x-(9/14)=0
Domain of the equation: 4x!=0
x!=0/4
x!=0
x∈R
Domain of the equation: 7x!=0We add all the numbers together, and all the variables
x!=0/7
x!=0
x∈R
3/4x-5/7x-(+9/14)=0
We get rid of parentheses
3/4x-5/7x-9/14=0
We calculate fractions
(-1764x^2)/392x^2+294x/392x^2+(-280x)/392x^2=0
We multiply all the terms by the denominator
(-1764x^2)+294x+(-280x)=0
We get rid of parentheses
-1764x^2+294x-280x=0
We add all the numbers together, and all the variables
-1764x^2+14x=0
a = -1764; b = 14; c = 0;
Δ = b2-4ac
Δ = 142-4·(-1764)·0
Δ = 196
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{196}=14$$x_{1}=\frac{-b-\sqrt{\Delta}}{2a}=\frac{-(14)-14}{2*-1764}=\frac{-28}{-3528} =1/126 $$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(14)+14}{2*-1764}=\frac{0}{-3528} =0 $
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