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2/3x-x=-21
We move all terms to the left:
2/3x-x-(-21)=0
Domain of the equation: 3x!=0We add all the numbers together, and all the variables
x!=0/3
x!=0
x∈R
-1x+2/3x+21=0
We multiply all the terms by the denominator
-1x*3x+21*3x+2=0
Wy multiply elements
-3x^2+63x+2=0
a = -3; b = 63; c = +2;
Δ = b2-4ac
Δ = 632-4·(-3)·2
Δ = 3993
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}$$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}$
The end solution:
$\sqrt{\Delta}=\sqrt{3993}=\sqrt{121*33}=\sqrt{121}*\sqrt{33}=11\sqrt{33}$$x_{1}=\frac{-b-\sqrt{\Delta}}{2a}=\frac{-(63)-11\sqrt{33}}{2*-3}=\frac{-63-11\sqrt{33}}{-6} $$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(63)+11\sqrt{33}}{2*-3}=\frac{-63+11\sqrt{33}}{-6} $
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