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3x+4+5y-7x
3x-7x+4y+5y
-4x+9y
4a.(3y-5)-(5-3y)
3y-5-5+3y
3y+3y-5-5
6y-10
4b.(3x kuadrat-6x+8)-(3x kuadrat+4x-2)
3x kuadrat-6x+8-3x kuadrat-4x+2
-10x+10
5.(2+3x)(2-3x)
2(2-3x)+3x(2-3x)
4-6x+6x-9xkuadrat
4-9xkuadrat
2.2+2.3x-3x.2-3x.-3x
4+6x-6x+9x²
4+9x²