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3/11a-11=7a+99
We move all terms to the left:
3/11a-11-(7a+99)=0
Domain of the equation: 11a!=0We get rid of parentheses
a!=0/11
a!=0
a∈R
3/11a-7a-99-11=0
We multiply all the terms by the denominator
-7a*11a-99*11a-11*11a+3=0
Wy multiply elements
-77a^2-1089a-121a+3=0
We add all the numbers together, and all the variables
-77a^2-1210a+3=0
a = -77; b = -1210; c = +3;
Δ = b2-4ac
Δ = -12102-4·(-77)·3
Δ = 1465024
The delta value is higher than zero, so the equation has two solutions
We use following formulas to calculate our solutions:$a_{1}=\frac{-b-\sqrt{\Delta}}{2a}$$a_{2}=\frac{-b+\sqrt{\Delta}}{2a}$
The end solution:
$\sqrt{\Delta}=\sqrt{1465024}=\sqrt{64*22891}=\sqrt{64}*\sqrt{22891}=8\sqrt{22891}$$a_{1}=\frac{-b-\sqrt{\Delta}}{2a}=\frac{-(-1210)-8\sqrt{22891}}{2*-77}=\frac{1210-8\sqrt{22891}}{-154} $$a_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(-1210)+8\sqrt{22891}}{2*-77}=\frac{1210+8\sqrt{22891}}{-154} $
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