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7x+7+79+9x^2=180
We move all terms to the left:
7x+7+79+9x^2-(180)=0
We add all the numbers together, and all the variables
9x^2+7x-94=0
a = 9; b = 7; c = -94;
Δ = b2-4ac
Δ = 72-4·9·(-94)
Δ = 3433
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}$$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}$$x_{1}=\frac{-b-\sqrt{\Delta}}{2a}=\frac{-(7)-\sqrt{3433}}{2*9}=\frac{-7-\sqrt{3433}}{18} $$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(7)+\sqrt{3433}}{2*9}=\frac{-7+\sqrt{3433}}{18} $
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