X+17×4+8×4=7×9×12+63×88
=> X+100 = 6300
=> X = 6300 - 100
X = 6200
\(x+17\times4+8\times4=7\times9\times12+63\times88\)
\(\Rightarrow x+4\times\left(17+8\right)=63\times\left(12+88\right)\)
\(\Rightarrow x+4\times25=63\times100\)
\(\Rightarrow x+100=6300\)
\(\Rightarrow x=6200\)
Vậy x = 6200