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=7x-5y
b.8x-4y+4x-6y=(8x+4x)(-4y-6y)
=12x-10y
c.4x²-3x-8x²+3=(4x²-8x²)-3x+3
=4x²-3x-3
d.x²+3x+4x-5=x²(3x+4x)-5
=x²+7x-5