(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=$\frac{4968245}{17}$
HỌC TỐT