Tìm x biết : ( 17x – 5 . 7^2 ) : 23 = ( 23^2 – 8^2 )^2 – 15^2

(17x-5.$7^{2}$):23=$($23^{2}$-$8^{2}$)^{2}$-$15^{2}$ 

⇔(17x-5.49):23=$(529-64)^{2}$-225

⇔(17x-245):23=$(465)^{2}$-225

⇔(17x-245):23=216225-225

⇔(17x-245):23=216000

⇔17x-245=216000.23

⇔17x-245=4968000

⇔17x=4968000+245

⇔17x=4968245

⇔x=$\frac{4968245}{17}$

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