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6(3x+5)=7(2x+2)18x-14
We move all terms to the left:
6(3x+5)-(7(2x+2)18x-14)=0
We multiply parentheses
18x-(7(2x+2)18x-14)+30=0
We calculate terms in parentheses: -(7(2x+2)18x-14), so:We get rid of parentheses
7(2x+2)18x-14
We multiply parentheses
252x^2+252x-14
Back to the equation:
-(252x^2+252x-14)
-252x^2+18x-252x+14+30=0
We add all the numbers together, and all the variables
-252x^2-234x+44=0
a = -252; b = -234; c = +44;
Δ = b2-4ac
Δ = -2342-4·(-252)·44
Δ = 99108
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}$$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}$
The end solution:
$\sqrt{\Delta}=\sqrt{99108}=\sqrt{36*2753}=\sqrt{36}*\sqrt{2753}=6\sqrt{2753}$$x_{1}=\frac{-b-\sqrt{\Delta}}{2a}=\frac{-(-234)-6\sqrt{2753}}{2*-252}=\frac{234-6\sqrt{2753}}{-504} $$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(-234)+6\sqrt{2753}}{2*-252}=\frac{234+6\sqrt{2753}}{-504} $
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