Tách tách tách :v
$(15-2x)(4x+1)-(13-4x)(2x-3)-(x-1)(x+2)+x^2=52$
$=>(60x+15-8x^2-2x)-(26x-39-8x^2+12x)-(x^2+3x+2)+x^2=52$
$=>60x+15-8x^2-2x-26x+39+8x^2-12x-x^2-3x-2+x^2=52$
$=>(8x^2-8x^2+x^2-x^2)+(60x-2x-26x-12x-3x)+(15+39-2)=52$
$=>17x+52=52$
$=>x=0$