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2/3x-18x=27
We move all terms to the left:
2/3x-18x-(27)=0
Domain of the equation: 3x!=0We add all the numbers together, and all the variables
x!=0/3
x!=0
x∈R
-18x+2/3x-27=0
We multiply all the terms by the denominator
-18x*3x-27*3x+2=0
Wy multiply elements
-54x^2-81x+2=0
a = -54; b = -81; c = +2;
Δ = b2-4ac
Δ = -812-4·(-54)·2
Δ = 6993
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}$$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}$
The end solution:
$\sqrt{\Delta}=\sqrt{6993}=\sqrt{9*777}=\sqrt{9}*\sqrt{777}=3\sqrt{777}$$x_{1}=\frac{-b-\sqrt{\Delta}}{2a}=\frac{-(-81)-3\sqrt{777}}{2*-54}=\frac{81-3\sqrt{777}}{-108} $$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(-81)+3\sqrt{777}}{2*-54}=\frac{81+3\sqrt{777}}{-108} $
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