a, \(8x-7x-6x+9x=4x\)
b, \(25x^2y-55x^2y=-30x^2y\)
c, \(-6xy^3+6xy^3+6x^3y=6x^3y\)
d, \(3x^4+4x^3-4x^4=4x^3\)
e, \(3x^2y+4x^2y-x^2y=6x^2y\)
f, \(x^5y^6-7x^5y^6+56x^6y^5=-6x^5y^6+56x^6y^5\)
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a, 8x−7x−6x+9x=4x8x−7x−6x+9x=4x
b, 25x2y−55x2y=−30x2y25x2y−55x2y=−30x2y
c, −6xy3+6xy3+6x3y=6x3y−6xy3+6xy3+6x3y=6x3y
d, 3x4+4x3−4x4=4x33x4+4x3−4x4=4x3
e, 3x2y+4x2y−x2y=6x2y3x2y+4x2y−x2y=6x2y
f, x5y6−7x5y6+56x6y5=−6x5y6+56x6y5
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