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3/7x+6=2+x
We move all terms to the left:
3/7x+6-(2+x)=0
Domain of the equation: 7x!=0We add all the numbers together, and all the variables
x!=0/7
x!=0
x∈R
3/7x-(x+2)+6=0
We get rid of parentheses
3/7x-x-2+6=0
We multiply all the terms by the denominator
-x*7x-2*7x+6*7x+3=0
Wy multiply elements
-7x^2-14x+42x+3=0
We add all the numbers together, and all the variables
-7x^2+28x+3=0
a = -7; b = 28; c = +3;
Δ = b2-4ac
Δ = 282-4·(-7)·3
Δ = 868
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}$$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}$
The end solution:
$\sqrt{\Delta}=\sqrt{868}=\sqrt{4*217}=\sqrt{4}*\sqrt{217}=2\sqrt{217}$$x_{1}=\frac{-b-\sqrt{\Delta}}{2a}=\frac{-(28)-2\sqrt{217}}{2*-7}=\frac{-28-2\sqrt{217}}{-14} $$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(28)+2\sqrt{217}}{2*-7}=\frac{-28+2\sqrt{217}}{-14} $
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