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=x"+7x+12
2. =3x"-15x+2x-10
=3x"-13x-10
3. =2y"+8y-3y-12
=2y"+5y-12
4 =6y"+21y-8y-28
=6y"+13y-28
5 =20y"-16y-15y+12
=20y"-31y+12