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3/5x-6=18-4x-1
We move all terms to the left:
3/5x-6-(18-4x-1)=0
Domain of the equation: 5x!=0We add all the numbers together, and all the variables
x!=0/5
x!=0
x∈R
3/5x-(-4x+17)-6=0
We get rid of parentheses
3/5x+4x-17-6=0
We multiply all the terms by the denominator
4x*5x-17*5x-6*5x+3=0
Wy multiply elements
20x^2-85x-30x+3=0
We add all the numbers together, and all the variables
20x^2-115x+3=0
a = 20; b = -115; c = +3;
Δ = b2-4ac
Δ = -1152-4·20·3
Δ = 12985
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}$$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}$
The end solution:
$\sqrt{\Delta}=\sqrt{12985}=\sqrt{49*265}=\sqrt{49}*\sqrt{265}=7\sqrt{265}$$x_{1}=\frac{-b-\sqrt{\Delta}}{2a}=\frac{-(-115)-7\sqrt{265}}{2*20}=\frac{115-7\sqrt{265}}{40} $$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(-115)+7\sqrt{265}}{2*20}=\frac{115+7\sqrt{265}}{40} $
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