Lizzymizzy Lizzymizzy 22-08-2018 Mathematics contestada Simplify each expression -1+3x^2-9y+2x+6y-3 5y-3x+2x^2+10-3y-2x^2 4x^2+9y-5-3x^2-5y-3+2x 3x^2+7y+3x-2y+2-y