ПОМОГИТЕ ПОЖАЛУЙСТА КАК МОЖНО СКОРЕЕ!!!

упростите выражения
1) (y-8)(2y+1)-(3y+1)(y-6)
2) (2x-3y)(2x+3y)+(3x+2y)(3x-2y)
3) (x+1)^2-(x-3)(x+3)
4) (y-4)(y+3)-(y-6)^2
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