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x²(3x-5-3)=5x² |÷x²
3x-7=5
3x=12
x=4
xy-xz+yt-zt=x(y-z)+t(y-z)=(x+t)(y-z)
mx-my+nx-ny+px-py=m(x-y)+n(x-y)+p(x-y)=(x-y)(m+n+p)
x²y²-1-y²+x²=?