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5x-6/7x+2=5
We move all terms to the left:
5x-6/7x+2-(5)=0
Domain of the equation: 7x!=0We add all the numbers together, and all the variables
x!=0/7
x!=0
x∈R
5x-6/7x-3=0
We multiply all the terms by the denominator
5x*7x-3*7x-6=0
Wy multiply elements
35x^2-21x-6=0
a = 35; b = -21; c = -6;
Δ = b2-4ac
Δ = -212-4·35·(-6)
Δ = 1281
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}$$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}$$x_{1}=\frac{-b-\sqrt{\Delta}}{2a}=\frac{-(-21)-\sqrt{1281}}{2*35}=\frac{21-\sqrt{1281}}{70} $$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(-21)+\sqrt{1281}}{2*35}=\frac{21+\sqrt{1281}}{70} $
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