The correct option is A x=−5
Given,x+7−8x3=176−5x2⟹3x+21−8x3=17−15x6[TakingLCMonLHSandRHS]⟹−5x+213=17−15x6⟹−5x+21=17−15x2[Multiplyingbothsidesby3]⟹2(−5x+21)=17−15x[Bycross−multiplication]⟹−10x+42=17−15x⟹−10x+15x=17−42[Transposing−15xtoLHSand42toRHS]⟹5x=−25⟹x=−5[Dividebothsidesby5]