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X+4/7X=88
We move all terms to the left:
X+4/7X-(88)=0
Domain of the equation: 7X!=0We multiply all the terms by the denominator
X!=0/7
X!=0
X∈R
X*7X-88*7X+4=0
Wy multiply elements
7X^2-616X+4=0
a = 7; b = -616; c = +4;
Δ = b2-4ac
Δ = -6162-4·7·4
Δ = 379344
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}$$X_{2}=\frac{-b+\sqrt{\Delta}}{2a}$
The end solution:
$\sqrt{\Delta}=\sqrt{379344}=\sqrt{16*23709}=\sqrt{16}*\sqrt{23709}=4\sqrt{23709}$$X_{1}=\frac{-b-\sqrt{\Delta}}{2a}=\frac{-(-616)-4\sqrt{23709}}{2*7}=\frac{616-4\sqrt{23709}}{14} $$X_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(-616)+4\sqrt{23709}}{2*7}=\frac{616+4\sqrt{23709}}{14} $
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