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3x*7x=8x+x
We move all terms to the left:
3x*7x-(8x+x)=0
We add all the numbers together, and all the variables
3x*7x-(+9x)=0
Wy multiply elements
21x^2-(+9x)=0
We get rid of parentheses
21x^2-9x=0
a = 21; b = -9; c = 0;
Δ = b2-4ac
Δ = -92-4·21·0
Δ = 81
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{81}=9$$x_{1}=\frac{-b-\sqrt{\Delta}}{2a}=\frac{-(-9)-9}{2*21}=\frac{0}{42} =0 $$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(-9)+9}{2*21}=\frac{18}{42} =3/7 $
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