3/4x+8=1/3x-7

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Solution for 3/4x+8=1/3x-7 equation:



3/4x+8=1/3x-7
We move all terms to the left:
3/4x+8-(1/3x-7)=0
Domain of the equation: 4x!=0
x!=0/4
x!=0
x∈R
Domain of the equation: 3x-7)!=0
x∈R
We get rid of parentheses
3/4x-1/3x+7+8=0
We calculate fractions
9x/12x^2+(-4x)/12x^2+7+8=0
We add all the numbers together, and all the variables
9x/12x^2+(-4x)/12x^2+15=0
We multiply all the terms by the denominator
9x+(-4x)+15*12x^2=0
Wy multiply elements
180x^2+9x+(-4x)=0
We get rid of parentheses
180x^2+9x-4x=0
We add all the numbers together, and all the variables
180x^2+5x=0
a = 180; b = 5; c = 0;
Δ = b2-4ac
Δ = 52-4·180·0
Δ = 25
The delta value is higher than zero, so the equation has two solutions
We use following formulas to calculate our solutions:
$x_{1}=\frac{-b-\sqrt{\Delta}}{2a}$
$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}$

$\sqrt{\Delta}=\sqrt{25}=5$
$x_{1}=\frac{-b-\sqrt{\Delta}}{2a}=\frac{-(5)-5}{2*180}=\frac{-10}{360} =-1/36 $
$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(5)+5}{2*180}=\frac{0}{360} =0 $

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