simplify: 12a^2b^3-4ab+8ab^3/-8ab^3
simplify: (7x+3x^2-2)-(11x^3-4x+9)
simplify: -2x^3y^2-xy-9x^5y/-2x^3y^2
simplify: (3x^2-10x+3)+(x-3)
simplify: (-1+8x^2+2x)+(4x-1)
simplify: 2a^2b(3a^3-ab+b^3)
simplify: (3a^3b^-2/ab^-3)^2
simplify: (-3x^2yz)^4
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