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16.5+3/2r=12+2r
We move all terms to the left:
16.5+3/2r-(12+2r)=0
Domain of the equation: 2r!=0We add all the numbers together, and all the variables
r!=0/2
r!=0
r∈R
3/2r-(2r+12)+16.5=0
We get rid of parentheses
3/2r-2r-12+16.5=0
We multiply all the terms by the denominator
-2r*2r-12*2r+(16.5)*2r+3=0
We multiply parentheses
-2r*2r-12*2r+33r+3=0
Wy multiply elements
-4r^2-24r+33r+3=0
We add all the numbers together, and all the variables
-4r^2+9r+3=0
a = -4; b = 9; c = +3;
Δ = b2-4ac
Δ = 92-4·(-4)·3
Δ = 129
The delta value is higher than zero, so the equation has two solutions
We use following formulas to calculate our solutions:$r_{1}=\frac{-b-\sqrt{\Delta}}{2a}$$r_{2}=\frac{-b+\sqrt{\Delta}}{2a}$$r_{1}=\frac{-b-\sqrt{\Delta}}{2a}=\frac{-(9)-\sqrt{129}}{2*-4}=\frac{-9-\sqrt{129}}{-8} $$r_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(9)+\sqrt{129}}{2*-4}=\frac{-9+\sqrt{129}}{-8} $
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