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a)10b+6×^2-4bx
#6
a) -(4y^2 -5x^2+4x^2-2)+(3y^3+6x^2-5x^3-3x)
-4y^2+5x^2-4x^2+2 +3y^3+6x^2-5x^3-3x
-5x^3+7x^2-3x -4y^2+3y^3+2